I am going to put a metal frame screened in room, but want a wooden screen door. Is this possible?
Easily replaced. Check the big box stores. Buy a roll of screening, and the directions are on the packaging. 15-20 minutes, if you're slow. $15 max.
All according to how heavy door is and how cut up your hands are from handling metal framing. Seriously, you may have to frame door using metal backed with wood. 2x2 or 2x4. Whichever looks best and works. Again, depends on choice of door.
Depending on the climate of the area where you live, A wood door would be hard to keep from bowing or even rotting, termites many other things could happen to it, My Son I put a screened in porch with a metal door that is lite weight, but has a catch on it to retract slowly, it also as a hinge that can hold it open so you can move things in or out as needed. You can put a wood door on a metal screen if you wish, check with home depot or Lowes, any hardware store would have one.
All you need to do is tap / drill holes into the metal frame around the door. Keep in mind that if the metal screws loosen up over time, you'll need to drill new holes; I suggest you use nuts bolts to keep it solidly tied together. Use NyLocks or nuts with a nylon insert - these don't back out. You could always go 'overbuild' use Nylocks OVER a 'regular' nut; this would prevent backing out but then you'd probably never get the bolt off if you want to change the door out for any reason (this would be for the hinges). Also pay attention to the metal frame see if you need to manually add some weather stripping to this area (the doors don't usually get anything there other than a sweep @ the bottom / floor end of the door). If you don't want to have to go back to the metal door frame do any maintenance anytime soon, be sure to sand prime before painting - otherwise, it will chip too fast easily.