My 6 speed TTI box cost $5K, I sold a good TZ350G to buy it. I built the bike in 1978. The rolling Seeley chassis cost me $150 with tanks and ceriani forks. The motor cost $1300, carbs were about $500. The original 4 speed CR box cost $150, but $600 for the gear set after I raced it only once with standard ratios and found it revolting. Seat cost $150. I think my bike is worth about $25K (not for sale).
Like Kenny, I use two Lockheed calipers on the front. One came with the chassis, the other I swapped a small Amal GP carburetor for.
The bike was an easy build, all I had to do was make a set of aluminium engine plates and a front brace, and bolt all the bits together. I only ever built it because it had some sort of authenticity about it (similar to the Gus Kuhn Nortons), and it was a good thing to do. I didn't race it until 2002, simply because I did not believe in the 850 commando motor, and I still expect the explosion. I'm really careful to never rev it past 7,500 RPM. I think the commando engine is really amazing, my bike is really great to ride with it's superlight frame, and torquey engine. There are no hot bits in the motor, however it is still fast enough using methanol fuel and a home made two into one exhaust, a bit of minor porting and playing with the cam timing to compensate for the pipe help too.
'Some things are so bad, that they are good' ! ! !
If I was starting again, I would build this. It is the same frame that Slater of Bromwich, and Patrick Godet used for the Vincent motor. There was a similar rolling Egli chassis going for $1500 around here a few years ago. None of this stuff is rocket science. Just keep your eyes open and shop around :
