All my panels are held via magnets, no hinges at all. Bought them at the big box store (HD). Only thing to keep in mind is you will need a place to set the panel when accessing system, so keep that in mind.
Not using any on my stand (sump isn't in it) but I use em for other stuff. I grab em from American Science & Surplus since they have a local retail store, but they do ship as well. They have a bunch of stuff that comes in handy for various things.
+1 on mfinn's post ^above^ www.magnets4sale.com Marty referred me to them years ago and has been the best place I found and have ordered from them many times.
I designed the latches and 3D printed them. Used forstner bit to drill out a flat bottom hole in each corner of the panels and doors and set the magnets in with some CA glue.
I love being able to pull everything off when doing maintenance.