Concerning the vacuum reservoir, look again. It is actually INSIDE the fender with only a flat plastic surface visible. If you pulled a hood mounted unit off of an older vehicle, it will perform the same function provided it is sealed and you have a place for it to securely mount & fit.
There is only one small vacuum port and that is located on the same fitting that the PCV valve connects to. If your small nipple is broken off of this fitting, you will either have to replace the fitting, or make proper repairs to your current fitting (epoxy, etc). If you do not know how to make the proper repairs, you likely will just want to replace the fitting. It twists off of the lower intake manifold after pressing in on two tabs if I remember correctly. The very next item in the line needs to be a check valve. This keeps vacuum pressure in the vacuum system so the accessories can function properly while the engine is not producing a lot of vacuum (wide open throttle and/or heavy engine load).
As far as where the vacuum hose goes through the firewall, you will have search for that information or wait for someone else to respond. I have never gone looking for it. Don't get the hood release cable confused with a vacuum line though.
Concerning the EVAP system, I'm not sure I would worry your head about that. If you do not have a check engine light stating otherwise, you likely have a properly installed and functioning EVAP system.
For a view of a lot of the components on an SCFI engine (96+), take a look at the fuel pressure test thread which can be found in the Tech Article (DIY) Index link in my signature. Also found using the search feature is this handy view which applies to the 98+ NV233 (NP1) equiped vehicles:
Much of this information is out there it just might take a little of your time to find it. Suffice to say that if I say its out there, I likely typed it out at some point or another and that you should be able to find it. Once you figure out how to use the search feature, a lot of your answers will be easily found.