 I have thought about a 29er fork but isn't the rake (or some such technical term) also different,
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 Kona Project II butt ugly fork but I think it's only 80-100mm corrected. Like the idea of going for a 29er fork that's a good idea.
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 It should be alright if the bike's set up for a longer travel fork anyway.STW mag did it with a Chameleon the other month,with a Surly Karate fork & 29" wheel,they said it rode fine....
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 Different offset, and hence trail for a given head angle. Hang on, let me do sums... OK. Claimed 456 head angle with a 120mm fork is 69.5deg. Let's say you put a 100mm-equivalent rigid on there, and assume that you get a 70.5deg head angle (which it will roughly be). With 38mm offset (fairly normal for a 26in fork) that's 78mm of trail, which is perfectly acceptable. Or you put a 29er fork that's 465mm a-c (which is a vague average of three forks found on Google), which'll put the HA back to something like, er, 68.5ish, but the fork's got 44mm of offset which gives you 84.5mm of trail. Which, coincidentally, is the same as the original 69.5deg head angle with a 38mm fork offset. I think it'd work.
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What you said was: OK. Claimed 456 head angle with a 120mm fork is 69.5deg. Let's say you put a 100mm-equivalent rigid on there, and assume that you get a 70.5deg head angle (which it will roughly be). With 38mm offset (fairly normal for a 26in fork) that's 78mm of trail, which is perfectly acceptable. Or you put a 29er fork that's 465mm a-c (which is a vague average of three forks found on Google), which'll put the HA back to something like, er, 68.5ish, but the fork's got 44mm of offset which gives you 84.5mm of trail. Which, coincidentally, is the same as the original 69.5deg head angle with a 38mm fork offset. What I read was: Gobble gobble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble wabble blah goooble wobble dobble blah blah wibble wibble offset.
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 OK. Claimed 456 head angle with a 120mm fork is 69.5deg. Let's say you put a 100mm-equivalent rigid on there, and assume that you get a 70.5deg head angle (which it will roughly be). With 38mm offset (fairly normal for a 26in fork) that's 78mm of trail, which is perfectly acceptable. Or you put a 29er fork that's 465mm a-c (which is a vague average of three forks found on Google), which'll put the HA back to something like, er, 68.5ish, but the fork's got 44mm of offset which gives you 84.5mm of trail. Which, coincidentally, is the same as the original 69.5deg head angle with a 38mm fork offset. you need to get out more Mr Davis ! 
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There you go,told you it'd work  .
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You could have just skipped to "I think it'd work" I have a spreadsheet to work that stuff out. Is that a good or a bad thing?
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OK I love it when a plan comes together. Unfortunately, crc have let me down on the singlespeed crank I ordered, it was in stock when I ordered it, now its not in until the 11th of next month, unfortunately its 70pounds from them and 120euros from the German suppliers so I will wait.
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Why not use a normal crank with just one cog~
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Aye, what BHB said. "Singlespeed crank" = "the crank you've already got with two chainrings removed". If you want to be flash you could get some short chainring bolts
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 Don't you have a young offspring you could be spending time with rather than creating spreadsheets MD?
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Not during office hours
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And right now they're in bed and all is quiet. For a change
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the spreadsheets come ready made, it just involves typing in new numbers, any monkey could do it.
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Only thing I remember about spreadsheets is in windows if you type in X97 L97 press tab and click on chart (or something like that) it opens up a flight simulator...
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I don't have an existing crank, its an old frame i am building up.
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 I've got a Truvativ ss stylo crankset you can have msp foc if you need one. 180mm length but a bit scuffed and ISIS.
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