Finally mounted the access panel last night. I thought this would be a simple process, but it ended up taking almost 2 hours. I should have stuck with a single pair of hinges, becase it was difficult to line up 4 hinges with each other, and in the end, four still weren't strong enough to hold the heavy plywood door open. Also, for some unknown reason, the access panel wasn't opening straight & true, even though everything was square when in the "down" position. So...long story short, after 2 hours of fumbling around with hinge placement, I had the door on.
Access panel attached, without trim, to ensure an equal gap all around. I had to use the rotary saw and remove an additional 1/8" from the bottom of the panel, as it was too snug against the frame.
In the "up" position. I spent a lot of time adjusting the hinges to get the right motion out of the door.
The 1-1/4" pine chair rail trim going on, with the 45° corner joints mitered on the compound miter saw. I was able to get about 1/8" of overlap over the seam without binding the hinges, which covers the gap nicely. Hopefully this will block any light from the metal halides from leaving the cabinet.
Finished trim. On the sides & bottom trim, I overlapped it a full 1/2" because the overlap doesn't affect the hinge motion in these areas. Also, I wanted the trim to line up with the tank opening on the sides, which I had originally designed for a 1/2" overlay....so it ended up working out nicely. The top trim is 3/8" lower than it was designed to be, but it's not terribly noticeable. I can definitely live with it, I'm just glad the hinges work with the 1/8" overlay I was able to achieve.
Here you can see the trim completely butts up against the main front panel when open. It's not quite able to open 90° but it's close enough for me.
The access panel door and the main front panel of the cabinet are flush, with the trim covering the seam. Here's a clear perspective of this.
Even with four hinges, the door is still too heavy for them to hold it open. So, I'll just go back to Rockler and buy one of those sliding lever doo-hickeys to hold the door open.
Well that does it for the top section...it's now 100% complete and ready for final wood filler/sanding/priming/painting.