I've been looking at making this work for a while, picked up 75% of a Derbi GP1 250 a few months back and after almost a year of searching & a 220 miles round trip into the middle of London of Sunday picked up a complete GTS300 Engine & Electrics to get the project off the ground. I spent most a good few hours Yesterday loosely fitting the engine into the frame, I ended up using a mix of the Runner & GTS engine mountings. I've mock fitted the Forks, I'll have to get a set of Yolks made up to take the massive upside down Marzocchi Forks, ironically they look very similar to the 'Monster' Forks PM have not long released. I'm using the Derbi Wheels, both 14", may have to fit the Derbi Gearbox as the GTS runs a 12" Rear so I'm not 100% as to the the ratios. I'm also using the Derbi AJP Brakes, Twin Radial Fronts so Its running Twin discs, need to buy the 'Step-Up' plate to fit the rear caliper as the GP1 uses a larger rear disc? The Rear Runner Bitubo Shocks Seem to fit ok, need to refit the GTS Exhaust/Support Plate to mount the otherside, I'm looking at using a PM 'Scomadi' Pipe to rid the original concrete silencer that rot to bits. I'll get the pics I took at various stages loaded onto Photobucket and attached into the post, I took them on the highest resolution so there around 4-5mb each!