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i think you're probably going about it the right way with the big sheets.
however, i ordered bamboo worktops cut to size from https://www.worktop-express.co.uk/online-bespoke-worktop-tool/ and they all fit together and were installed without any drama (i think i had to plane a little bit off one of the back edges)
any minor gaps on the back edge close to the walls were covered up when i did the backsplash tiling.
Coincidentally the kitchen fitter quote bloke just left, and he said that they can cut everything themselves from rectangular sheet - except for under-mounted sink hole. Presumably that's just a bit too on-show to risk it. So we'll order a big old rectangle with a sink hole and let them do the rest.
Annoyingly they said that our fridge socket isn't up to code - needs to have a remote switch as it's a built-in fridge. Looks like our waste pipe and water pipes are also slightly in the wrong place so will need moving or we'll have to have half-depth drawers in those places.
Constant niggles.