Surely you read that? Edit: Front freewheel- the drive comes from the front/cranks/freewheel Rear freehub, the drive comes from the hub. To run a freewheel you NEED a rear fixed hub... To run a freehub you NEED a fixed front sprocket.
Look at your cranks, if you spin them back and your chain moves, you've got a rear, 116mm FREE HUB. If the chain stays still when you spin the cranks backwards then you've got a front freewheel, and you need a 116mm FIXED HUB!
KO Km1/05/6 zoo python i think were the longest mod frames. Have a look in the "Trials Chat" section. Looks like Onza are considering making a loong mod!