Re: E-Trigger Frame
1. There isn't a definite answer to this, it could have all the internals, most do, or it may not have all the internals. Asking the seller is probably your best bet.
2. Yes and no. Stock, the trigger is typically not adjustable but you can buy aftermarket triggers that are adjustable, or modify the stock trigger to make it adjustable.
3. Yes, you should be able to find blade and/or scythe style triggers.