Small Compartment Door

Can anyone offer some tips for DIY compartment doors? What types of trims and seals, minimum corner radius, or squared-off corners, etc?
I would like an 8" x 10" door for my tongue storage box, but I can't seem to find a pre-manufactured door smaller than 9" x 12".
How does Camp-Inn do it?
I would like an 8" x 10" door for my tongue storage box, but I can't seem to find a pre-manufactured door smaller than 9" x 12".
How does Camp-Inn do it?