There is a beautiful replica on one of the Facebook groups with almost no internal carpeting that looks very much like the real one I’ve seen. My new Beck in the production queue will, for now at least, have far more, but I’m conflicted. I would welcome any thoughts about this from those with experience. 
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Spyders were no frills race cars. If you are attempting to build a true replica then no carper; only rubber floor mats in the foot wells. I had full carpeting in my Spyder and liked it. I also covered the rib in front of the seats. Without something there you will soon scrape off the paint getting in and out. Carpet covers a lot of sins.
Note the rubber floor mat on the drivers side. Carpet did not work well there and wore quickly.
I built mine without carpet. It has barberpole vinyl over the rockers and firewall, nothing on the floor under the seats and a wood "floating floor" ahead of the bulkhead with a rubber mat fixed.
The vinyl bits can come out and go back in with little trouble: they're velcro'd. It all looks exactly like it should.
That said, carpeting has got to be better for real-world livability. It's sound-deadening and renders acres of troublesome interior panels good looking without resort to paint or aluminum and rivets (or both, as I did). Simpler, cheaper, arguably "better" because, comes down to it, who are you trying to fool?
A lot like edsnova I did alloy in footwell, cut out the channel and put in a floating floor with rubber flooring on it and under the front of the seats. Left the rest bare metal to match the alloy in the footwell. Next I'll remove the carpet from tub, inner doors and firewall and replace with barber pole upholstery like the customer cars did in the 50/60's. Simple and very effective visually.
