Working on a design for a new aquarium hood. Is marine ply going to be OK?
or should I be looking at something else.

Basic design is rectangular frame from Alu or Wood (10x20mm) to sit on the
tank edge. With sides and top from the hood from 5mm marine ply. Top to be
in two parts hinged in the middle. Hope the diagram helps (x is the ply, o
is the frame that site on the glass, with a bi-fold piece of ply on the top
as a lid)

x
xo
xo
x
x


Is the marine ply going to be ok with the moisture from the tank, and the
heat from the lamps? What coating (varnish/paint) be used to protect?

The bi-fold lid with be approx 30cm by 1m. Is 5mm ply sufficient? Need to
keep weight down where possible, but be rigid enough?

Any suggestions?