KemppiFrog
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++lots of the above.. Open cars have enough rigiditiy problems without extending them. Torsion problems get loads worse if you lengthen the wheelbase.
I am quite surprised that such stuff can get an MOT without the attention of a structural engineer. Basicly guesswork on all sorts of levels. Which the guys at Toyota were not doing.
Having said that, I did stick weld a mid engined space frame chassis in the 70s. Road legal, and still used in hill climbs. Regs were 'slightly' easier then, then grandfathered up to now. But we didn't have MIGs then. I also joined two ends of a Renault R4 chassis together. But it was structuraly sound and gas welded.
Heed the advice.
I am quite surprised that such stuff can get an MOT without the attention of a structural engineer. Basicly guesswork on all sorts of levels. Which the guys at Toyota were not doing.
Having said that, I did stick weld a mid engined space frame chassis in the 70s. Road legal, and still used in hill climbs. Regs were 'slightly' easier then, then grandfathered up to now. But we didn't have MIGs then. I also joined two ends of a Renault R4 chassis together. But it was structuraly sound and gas welded.
Heed the advice.

We built a couple of space framed mid engined cars in Portugal, where it is practicly impossible to do so. So we started with two Lotus Europa write offs, legally imported and so had papers. The resulting cars had very little in common with the originals apart from a few suspension components. One was modeled after a Porsche 917. The police stopped us from time to time, but had no idea what the cars should look like and were more interested in chatting about them