Rutan Voyager had a very long flight.
Did pilots have a separate toilet room for when they needed to relieve themselves?
How much room did they have to move around anyways?
Is there any visual with the interior of aircraft?
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1$\begingroup$ Welcome to aviation.SE! We have a couple of related questions, they aren't specific to the Voyager but they have some general information: here, here. $\endgroup$– PondlifeCommented Dec 18, 2020 at 16:48
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1$\begingroup$ Glider pilots on very long flights use pee bags made for the purpose with the gel that turns the liquid urine into a solid goo. Some also use Depends diapers, which avoids certain "handling" issues. sosaglidingclub.com/uploads/1/6/5/2/16520160/… $\endgroup$– John KCommented Dec 18, 2020 at 17:54
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Did pilots have a separate toilet room for when they needed to relieve themselves?
Given the size and weight of the aircraft, this would be near impossible. There wouldn't even have been margins in the weight budget for toilet paper, let alone a toilet room.
I don't know if there is any official documentation about their bodily fluids.
I did find this quote:
Rutan even brought a small plastic bag with an adhesive, circular opening to answer the question he said he is often asked first—how did you go to the bathroom?
So, the answer seems to be that they glued a plastic bag to their bottoms.
How much room did they have to move around anyways?
Practically none. The aircraft had room for exactly one thing: fuel. If there had been room to move around, that means there was room that wasn't being used for fuel, so they would either have designed away the room or filled it with fuel.
The pilot flying was lying in a lightweight pilot seat, the pilot monitoring sat or lay on the floor next to the pilot flying.
Is there any visual with the interior of aircraft?
Yes, there are quite a number of photos, which you can easily find using your favorite search engine, for example:
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$\begingroup$ Must be a very big bag for such a long time. Didn't they flush and throw the waste from time to time? Saves mass - and therefore fuel. How much waste they produced in total? $\endgroup$– Joe JobsCommented Dec 18, 2020 at 17:30
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$\begingroup$ I think the rules for the endurance record(s) they were attempting prohibited "jettisoning" -- but it's not hard to arrange to minimize solid effluent via a few days of low-residue diet. Takes a few more days after the attempt to resume normal intestinal operation... $\endgroup$ Commented Dec 18, 2020 at 18:30