The first photo above of the chassis shows the original kit parts for the rear axle and swing arm. Converting the 917 wheels involved reducing the wheel width - the rear wheels especially on the Porsche are massively wide - until they fit inside the Buggy tyres. The diameter was close enough that only a small amount of filing of the tyre was necessary to get the new wheel to fit snugly into it.
Having done that I realised it would be better if they were mounted on the 917 axle, and then also that I could use the Porsche hubs with the disk brakes. I’m guessing not many 70s Beach Buggies had all round disk brakes. Here is the chassis with the heavier duty axle, struts and disk brakes.
I took the opportunity of this rework to turn the front wheels a little, which involved moving the steering arm pivot slightly. The front brake / axle mounting is a bodge, with the detail basically faked with a strip and some bolts to hide the cemented join.
Also in place is the tread plate pattern floor to cover what is otherwise just flat plastic in the kit. I guess rubber mats could be simulated with thin strips. This causes the floor the be raised by about 0.5mm, enough to affect our crew figures.
I’d also recognised by now, from photos of real Bugles, and from other builds of this kit, that the figures sit too high in the vehicle. Part of the solution was to remove material from the backs of their legs and bums. To accommodate the raised floor and to sit them lower it’s necessary to alter the angle of the lower legs so that their feet are takes higher.
For her legs, being joined together, I was able to drill into the backs of the knees and insert wedges to straighten them a little.
Doing the same on his legs resulted in one snapping off when the cement was applied, so a bit more work was required.
Not really visible, but a lot of work was done on the seats, scooping out material under their bums and backs, so that they actually appear to sit in seats that are made from something soft instead of perching on top. The seats and the figures don’t really fit together well, probably two sets of seats should have been offered, or the figures should have dead flat behinds.