Updated my R3 to V4 - this is a bit of bigger change and hopefully doesn't introduce a backroute.
V4:
Adjusted height of starting area for the slider lemmings
Increased save requirement to 55
Removed a gap underneath one of the plug sockets
V3:
Increased spacing between 2nd hatch and computer pillar area
V2:
Added another pillar to the right exit to prevent a backroute.