I have a screened in proch I have already added outside walls using t1-14 and a front door how much is it going to cost to finnish, I still need to add a sub floor, drywall and remove the skin from the mobile home where the old front door was and on the same wall remove the windows to make a walk through the room sixe is approx 15 x 20, I only have 800.00 left. will that cover costs for materials? someone please help?