The biggest trays I could use were 16x20". It's also the largest sheets I've ever printed on, and I was constantly worried about creasing the print (I only had 10 sheets — 9 to use, 1 for testing exposure).
Yeah, paper this size gets expensive, and is a bit more difficult for sure. You still managed fine, in my opinion, and the final product as several 16x20 sheets will be equally impressive as a single sheet. Nobody other than photographers will care.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh
I think it's already outstanding, but a perfectionist never finishes. here's some input.
I've recently started a project to print (enlarging) on 42" paper (roll, which i came across inexpensively, albeit rc)... my output would be 42in. x 63in. I've built a faux frame/easel (for $17)
supplies from Home Dep*t
1 1/2 baseboard 17ft ($0.69 per ft)
12 large washers 14 cents or so each
4 nuts to raise 4 washers to same height as others
12 neodymium magnets 3-4 bucks for tiny ones
The cheapest natural wooden baseboards are light enough to be held together by the super glue. While i am projecting horizontally, you can do so on the floor, or where ever. you might also be able to get away from buying the magnets and just use a large sheet of plexi? or use large strips of the cheaper magnets around the border... (the tiny neodymium ones are really strong by the way).
As for chemicals, I've bought 8" large pvc pipes (diy jobo style) and still do this under safelights since i don't have the light-tight caps like jobo or patterson. I also use a cabinet mesh to separate the paper from itself, always starting out with a water wash before starting any actual chemical process. I also use very diluted dektol and go around and separate the mesh from paper manually as it processes as an extra precaution.
Of course there's always the 'roll through a trough' method, which i don't trust myself with as it involves to much handling of the paper, for this clumsy guy.