Trunkie-
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.
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HatBeard
As soon as the weather clears up again i should be ready to cut my plywood sheeting for my desk. I was going to just screw it down through from the top and be done with it as i dont mind seeing the screws but i think it is probably worth using hidden fasteners as i cant really change my mind without replacing it then even if i dont need to worry about expansion with non-structural hardwood plywood as i understand it.
The supporting frame is all 38x68 cls studwork timber. Plywood is 18mm thickness
Should i just make the effort and use figure 8 fasteners and inlay then properly so i can easily replace the top when moneys less tight with something nicer or is there a better option i should consider.
This is the basic frame, i'm going to install some additional braces to support the top and give it a bit more rigidity but it feels pretty solid as is.