Hi Mike....
Please consider offering 6 pin drive hubs as on option. Yes, they're expensive and you need to keep your roller price reasonable, but I think you find that quite a few people will opt for them if they are available. Also,
you would be joining the ranks of the very few replica builders who do
offer them, optionally or otherwise. I can think of only several other builders
that do offer them, SA, ERA, SPF, Kirkham, FFR, and Cutting Edge.
"Little" things like pin-drive hubs and floor-mount pedals are often overlooked
but I think they DO have the potential to attract buyers to your product
that otherwise might pass it by.
I agree with others in this thread about transverse leaf springs. When someone mentions "transverse leaf spring," the first thing in many peoples
mind are vintage Fords like the Model T. Ol' Henry really liked them and
Ford didn't move away from them until after his death. But I think they're
vastly under-rated as a suspension system. C4 and up Vettes use them on
both ends and
VB&P (Vette Brakes and Products) even offers a kit to
convert C2/C3 front ends to leaf spring. (SKU 42030) Leaf springs are
equally effective, if not better than coil springs, at transmitting suspension loads to the chassis. The question seems to centre more on the use of a leaf
spring as an upright/wheel location element which isn't done with the Vette.
But combining a transverse leaf spring with a modern unequal-length a-arm
arrangement could be very effective and while it may suffer in terms of
historical accuracy, it would retain the spirit of the originals.
.....Fred