That 1000 roadster does look great. The short boot and top-hat profile are the only things that bother me about the 1000 design and your concept design above puts things into balance.

I would think a scaled passenger sitting in that seat would put things out of proportion but a nice deep bucket seat (very low to the floor) would keep them nice and low and within proportion to the vehicle.

I also think that design would almost certainly have the mirrors where the original doors meet the front guard. Guard mirrors up the front may look okay, can you put up a pic with mirrors on the door fronts near the windscreen and another pic with the mirrors at the very front of the guards?