Jim will stand behind his switch.
I think it would be easiest to go with new manual doors, but then, I've not done that. Really, it shouldn't be too hard to take the door apart and fix it good.
You may want to get doors with a good upper frame for your half doors. Gives you somewhere to hang the soft windows...
I made my side panels out of plywood, and put access doors in them. Covered them with Home Depot indoor/outdoor carpet. They are quiet, solid, and offer great storage. I think making side panels out of steel might make the thing sound like a tin can!
Let me know if I can help in any way.