Plan B is working! Putting together the candle offering luminary table was relatively quick and easy using the L brackets. While brazing the components would have made for a cleaner look, and I would have preferred having the brackets on the inside -- had I bought angle brackets instead of the flat ones I could have (note to self, buy angled next time) -- the black paint covers them up sufficiently and the low light of the haunt should hide any remaining obviousness of the brackets.
Speaking of the paint, I went with a hammered metal paint, primarily because it was what I had on hand that wasn't black gloss, but also, fortuitously, it gives the luminary table a, well, hammered metal appearance, which is totally appropriate.
Another fortuitous development from the table's construction was the support structure for a lower shelf area. While it was originally added for support so the table wouldn't be wobbly, it was immediately apparent it would be perfect for a shelf, too. And though I had considered thinner materials at first, a 3/4" MDF shelf and table top also give it plenty of strength and rigidity and I'll be able to use the lower shelf for displays, such as skulls, rats, etc. It worked out well in the end.
The one problem with the 3/4" MDF is that for the top shelf it meant that it was above the the tops of the legs that I had raised above the level of the cross members by a 1/2". And I had some gothic finials laying around from a fence I had built (but never finished) and while they fit perfect over the ends (with some help from shims), the MDF made it impossible for them to fit. I considered using 1/4" material, but it just seemed too flimsy and if I was going to have lit candles sitting on top of it I wanted it to be strong.
I could've went with 1/2" material of course, but I didn't have any on hand and didn't want to run to the store to get any, though I may revisit that before the end.
As an interim measure at least, I used some 3/4" square dowel I had on had and trimmed down the lower segment to 1/2" so that the lower end drops into the table leg while the upper 3/4" segment fits into the finial. I'll attach them with a screw. It will work with the 1/2" table top too, so it's adaptable.
Also, in one of those pictures I posted yesterday, there is a cross attached to the back. I like that look and if I have some flat stock on hand will try to make one. Just another detail add to the layering.