Before riveting anything I gotta bend out these heater louvers. The plans say clamp on some angle, but I couldn't figure out a good way to do that. I tried clamping wood on bothsides and bending out the flaps, but that was kinda clumsy.
I have this cheaping sheet metal seaming tool that I picked up at Harbor Freight. Turns out it slips onto thelouver flaps really easily and makes a nice bend.
I used this seaming tool to bend out all the louver flaps.