Picked up my 250 gal propane tank today and got it all flushed out and started on the door.Using a 4 1/2 " grinder with a cutoff wheel, works pretty good. I made my door 17 1/2" x 89 1/2", almost thinking the 17 1/2 is not big enough, Anyone see a problem with that size or should it be fine? No pictures because i do not know how to do that.