It would be a bit tricky to post plans, but I'll try to at least give you an idea of what we did. Of course, these plans assume that you are buying/building cages that are the same size as ours, which are 24"w x 16"d x 12"h.
It seems a little backwards, but start with the height of the bucket that you plan to use on the bottom, and work your way up. Our bucket was 13" tall, so I wanted the bottom of the lower gutter to be just over 13" from the floor. The gutter is 3" deep, so the left end was secured at 16" from the bottom. It slants up 2", so that the right end is 18" from the bottom. Below is a picture of the right hand end without flashing or cages, for reference.
For the upper level, we did our math from the top down. The cages are suspended from the bottom side of the supports at the top. The back piece of conduit is 17" down (on center), and the front piece of conduit is 21 1/2" down (on center. The top edge right end of the gutter sits just below the front conduit, at 22". It slopes down to the left 2", so the left end is secured at 24" from the top.
There is also a center support, and horizontal supports on each end (at 36" down from the top).
Now for plans, to try to make sense of it all. From someone who can't draw...this should be good.
The entire wood unit is 72" tall and 9'9" wide, to accommodate 10' gutters. This left plenty of space for a center support, as well as space between each cage and at both ends. It is 21" deep, including the width of the 2x4's on front and back. This unit is 2" deeper than the first one that we built, and I like it better.
Middle of back, with angle supports to prevent twisting
Close up of right side, back--we had to add pieces to the legs in order to secure the angle braces on the same depth as the top and middle.
Front of completed wood frame
Conduit, gutter, and support for flashing in place--I recycled some pieces of corrugated plastic, and zip tied it in place to help support the flashing.
Vinyl flashing in place--once the cages were hung, I secured the flashing to the back of the cages with a couple of zip ties also.
My favorite tool for cleaning now is a 2 gallon pump garden sprayer. It's like having a mini power washer to hose the flashing and gutters off, even daily if I want to do so.
If this makes no sense at all, please let me know. Construction was months ago, and I'm afraid the process is a bit fuzzy in my brain now.
*Do you know how tempting it was to be naughty with the title of this post?