Re: homemade rollers
What it amounts to is that you need a set up that has a very low pressure per square inch factor. Enough rollers and its fine.
I'm not 100% sure I grasp your concept though? How wide will each roller be?
If you looking to make your own roller bunks, the cheapest method I can think of would be to use guide rollers and cut them down either in two or three sections each to make your individual rollers. Then either split a section of square tubing to make your frame or use two pieces of angle iron. 'C' channel that isn't taper wall can be hard to find.