The bed doesn't show at all with a 90mm (using my black MkIV and a Nikkor 90/8 on a flat board) in either landscape or portrait orientation. My Linhof's bed does show with a 90mm in portrait orientation but it's a simple matter of adding some slight front rise to clear the bed. You should be good with your 80mm, on my 90mm @ infinity I still have a fair amount of thread left on the focusing screw. A recessed board will probably help you get some more flexibility out of the bellows though.
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