Hello Jay,
We build ours. We buy all the required materials from Amari.
Would recommend doing it yourself to save a few quid but it can be quite time consuming.
Make sure all the mitered corners are cut exactly at 45 degrees and the is plenty of internal support bars all with top and bottom bracing to stop the top or bottom sagging.
You need to consider where the gear trays are going to be located and make sure you have a fix point for the lamp holders within the range of the gear tray or you’ll end up fixing the lamp holders to the backing sheet. Not such a major problem when using di-bond but it will mean that the bulb rests on the uprights supports instead of above them.
Pieces of aluminum angle in the corners for support and loads of rivets holding the whole thing together and you should be ok.
Final tip. Make sure the beading is set to the right width for the panel you are going to be using. i.e 5mm panel needs a bigger gap than a 3mm panel. Make the gap to big and when you come to hang the panel the hanging strips will simply fall down off the rail.
Good luck..