When doing the sheets for siding I was quite lucky because I borrowed form my neighbour the bender with guillotine - he is a roofer (if its right word for the guy that makes roofs). I had to pay for this stuff doing some parts for him on the lathe any way it was worth it.
As an option on the bender you can install roller shear for cutting sheets as bellow. It's mainly for typical roof steel sheet 0,6mm thick but mine 1mm aluminium goes well as it's softer.
that is off course for straight cutting
For openings or curved cuts I've used makita sheet metal shears as you can see them on previous post.
Stapler is just the cheapest one I found used, pneumatic. I've used 12mm long staples as the longest that went through the sheet with no problem.