You could probably take care of at least the OFA gasket, just do it the way I do, just shove your arm up there and get to it. No need to remove a bunch of stuff, not even the coolant hoses. Gasket is cheap and try to save the coolant?
Not sure on valve cover gasket cost, but the job is easy if you just remove the motor mount bolt on the side you are trying to replace and jack that side if the motor up.
Which A/C line is leaking? I've successfully, on multiple occasions used JY A/C lines. It's not too hard to recharge the system yourself, just would be great if you could have someone vacuum the system before you charge it.
Tires? Can't help ya there, lol. Check craigslist? Might be time to sell some of those HIDs...
Why do you think the MAF is bad, again JY part.
I've been in your shoes, I think I sold a few items here and there to make money straight for the car, but you also have a backup vehicle...
Good luck!