Good work to whoever the author is, even though it's not a plus 8 (In that there are resource hacks, ammo hacks, and a health workaround; I make that around 3?). In any case, that's trivial, I have seen a few attempts by novices to do trainers for this, and while some options are easier (resources), some aren't (ammo, most certainly health etc). They tend to be 'workarounds' or have quite major side-effects which could royally screw up your save. Don't be expecting miracles with these that's all
It's a tricker-than-usual one.