Hi mate, you've done pretty well. But if your up for some constructive criticism Just a couple of things. You will get heat gradient whether the lights are coming off a wall or a ceiling, I put the heat source on enclosures that are side by side like yours in the centre against the centre wall, so the cool ends are on the outside. This achieves two things. You won't need as much heat and you will more likely always have gradient. Secondly, on your doors, all you need is silicon, not a timber bead. The bead will attract climbing (and falling) and hold crap. just make a good bead of silicon and imbed the glass into it. You can always go around the edge with more silicon if needed just to cover any sharp glass edge. This will leave you a flat internal door face that's easy to clean.
cheers