a12grunt has a good point, power to weight 12-15kg is a big difference
when you consider how light 1200 and 1000 cars can be made however for
anything bigger it makes little difference if not better weight balance.

Suzuki sierra jimny boxes are also another option for lightweight boxes
with strong simple design but close ratio sets are only an option if made
in that place in Argentina (german mob) there that supplies euro teams
for 1000usd a complete 5 speed setup but they only do phone call business