Good points Bob.

More than one way to do it right, something I think a few forget now and then.

For the steel cars, I like the inner frame reinforcing bit and plan to bend up a mini roll bar for under the cowl on my 31 (steel) roadster on 32 rails project.
If you don't run one of these you get a lot of cowl shake crossing RR tracks, cattle guards and the like.

If deuceforpapa's car is glass and the bulkhead - behind the seat area - is to be strengthened do not glass a plywood bulkhead to the body sides.
It will create a 'shadow' - or subtle bump - you can't get rid of.
This info from Wescot fwiw.

One nice way to reinforce the bulkhead area in a glass roadster is a square tubing framework.
A couple of horizontal bars, one bolted to floor and the other to the rear cockpit rail and maybe half a dozen vertical bars tying it all together.
Saw this done on one of Roy Fjastad (Deuce Factory) son's cars and it was a nice way to go.

I believe the framework was covered with sheet metal as a fireproof barrier and it probably had a piece of plywood spanning the area as well.
The plywood making life easy for the upholstery guy.

Bob is correct on the taking care of the batteries over the winter bit.
I moved my first Optima from the 32 to my car trailer to supply the potty room with light.
Eventually rewiring the trailer's original interior roof lights as well so the trailer lights didn't run off the truck battery.

I forgot about it after moving from California to Arizona and 8-12 months later the voltage was down to 8 volts.
I've recharged it several times and 11 volts is about as high as it gets.

Stupid is as stupid does someone said once upon a time....