I don't see why you just can't apply scenery (ground cover, foam for terrain contour) and structures to the gap piece and then simply lift it out when you want to enter or exit. You could even eliminate rail joiners if you attach small locating wood blocks to the legs (and on the other side to the Mianne beams) which would align the plywood base and positively position the track. Then use a couple of wires to the track section on the lift-out. Alternatively, you could construct a truss bridge to exactly span the gap and mount it so that it could be simply by lifted out.
MELGAR
