Welcome George. You may be slightly mad as apparently I may be also judging by some comments on another forum
but clearly there is nothing wrong with your ergonomic skills if you have managed to create a functioning darkroom in a two room flat.
I have a Durst 605M which is good for 6x6 but if big prints and the negs to go with them is the thing then one capable of 6x9 is ideal.
Mike
Mike