How longs a piece of string Phil ??
Depends how hog wild you go.. Importing all the bits that take your fancy or sourcing and fabbing stuff locally and making do out of parts bins.. Omars Dirt track Racing has tails and tanks, bar sets, and the like.. So if your lazy you can just order and go..
Paintwork and powdercoat is not hard locally.. And if you started with a good clean late model your not likely to have too many issues with smooth running, mechanicals, or engine bodges, which is the big grey area and trouble here IMO.
Back of a fag packet guess ?? 250 - 300 top whack.. Putting 150 - 200 into a bike to begin, and another 50 in parts and work each. Less if you hunt local and spanner yourself. If you hung on for the right 650 (I missed a booked w650 a year or two back for 130 with a farang leaving) or used the less pretty XS650 as a base maybe less. Careful spending might even get there at 200k or less fully legal, which I think is a hell of an appealing bike for the money. Or just take the lines and work to any thing you can find, I saw a CB175 twin for 50k recently and I know it would look close, with the twin pipes and all.. The GB250's or GB400s could be a donor also but the W650 or a Trumpet ($$) is the perfect base IMO.
Pikey showed me this one based on a Bonnie.. And have to admit that gives me a bit of a lob on too !!
http://www.mecatwin.com/en/motos/triump ... /index.htm
Trackers just have a 'real bike' look to me.. As do the modern scramblers.. Simple, useable, and cool. Also feels a little like every half assed hipsters got a bad attempt cafe build to go with the sailor tatt and ironic facial hair, and once its got hipster taint its ruined by association
That French outfit seems to do a kit package too.. But a lot of the fun would be making it your own.
http://www.mecatwin.com/en/motos/triump ... /index.htm