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it's all screwed into thick osb walls under the plaster with 100mm screws so it feels rock solid.
but i am going to cap off the window on the underside of the desk and probably build some shelves under there along the long wall for storage (think similar to a kallax but with 600mm openings to keep some of my larger board game boxes in) so i'll tie in a few uprights to that about 300mm in from the back.
regarding the table top, I ordered a pack of assorted figure 8 and z type tabletop fasteners (who knew these weren't really a thing outside of amazon/ebay in the uk) . will test both and go with the one i find easiest to install. think it's either making a 2mm inlay with a forstner bit for the figure 8 and chisel the corners off so it can pivot or cut a slot with a router slot cutter for the z type ones to slide in.
Is there going to be enough support at that corner or will you need a leg?