Well, I'm far from an expert, but I really prefer the solid hinges to the new CA ones. However, there are many many planes flying out there with them and doing fine. So this is your call.

The stripping is a matter of personal preference, I've seen many do this on their planes and also seen many who don't.

The firewall I would definately protect with a good coat of CA, thinned epoxy, or paint. The fuel soaking into the wood would not be a good thing at all.

Hope this helps,
Heath