There's nothing wrong with the rod box. They fall apart if you try and put G60/200hp through them but otherwise they are plenty tough enough.
Cable change boxes have a long throw and are a bit heavier. A 1.8T conversion you could justify the weight and engineering time to do the gearbox mounts.
I have driven MK1s with all sorts of wheel combinations. Standard 13s, 14s and 15s and you can try and tell me until you are blue in the face but 14s are the best all round for tyre availability/unsprung weight/etc I would stick with 13s if they were 6 inch wide and had 185 tyres on them.
270mm brakes because they fit under 14 inch wheels, that said I could handle 256mm at a push. A mate in the UK has a Turbo Technics MK1 with 175bhp and 239mm standard brakes. He thought they were ok.
No need for discs at the back except for cosmetic reasons.
Happy to keep debating with you on my choices mate.
Gavin
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