Mike Rocket J. Squirrel Elliott wrote:

I could make a right-angled fixture and screw it onto the side
of the MDF -- I could patch the screw holes later and paint
over them.

Or you could use a C-Clamp to hold your right-angled fixture in
place and not have screw holes to patch...

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/solar.html