What to use?

wow, thats alot of questions.  I'll get to the ones i can answer.  Rage gold is a body filler.  Its one of the best you can buy.  Its easier to work with.  As for what resin type to use, i know that most people use a regular polyester resin on sub boxes and interior peices.  I'm not sure what to use for parts like bumpers.  And i'm not sure of the difference between regular and premium.  I'll have to let someone else answer those.  But for interior peices regular polyester resin will work fine. 

Damn, no kidding, that is a cluster of questions.

Well, for one, refer to "number of glass layers xplained" at the top of this forum, as far as strength is concerned.

When you fabricate a hood for a car, it is really done in two layers.  There is the bottom layer, more of a frame to support the top layer.  It can be made out of composite material as well.  Then the top layer which will be what most consider, the actual hood... which Is what will be seen and/or painted.

If you are going to make your own hood.  I would examine some carbon fiber hooda first to kind of visualize where to go with it.  Chances are you are doing it to have a lite hood.  Carbon Fiber may be the best to go with since you can use less and still have superior strength, but it cost more than fibreglass strand or mat.

I might also mention, a lot of shops who manufacture hoods, use the VIP, or vacuum infusion process. The vacuum infusion process uses vacuum pressure to drive resin into a laminate. Materials are laid dry into the mold and the vacuum is applied before resin is introduced. Once a complete vacuum is achieved, resin is "pulled" into the laminate via carefully placed tubing.

Instead of gathering a mass of information about many different techniques all at once.  Ask for information on one particular project or problem at a time.

Otherwise, to respond to all of that, the forum would look like one big condensed "Manual" or book.

We are here to help you, though that was a lot to take in, hehehe

I do have a question, you say you have "all the videos."  Which videos did you get, and from where?