That room & layout seem awfully big for a 1st layout. Perhaps you can build it in sections adding on the 2nd & 3rd wall. I hope to do one wall of my N scale layout, but my wife is having a cow over 3 walls with a 2.5ft. wide, left wall, x 10 ft, -3,5 deep) back wall, ^ a right wall a 3.5 wall, 3rd wall, 8ft .x 1.5 (with turnaround loop 3.4 x 2.5 ft. - Room overall is 10 ft.x 12.5 ft. but 2.5 or so is for entrance door, folding closet 4 piece door. Desk for computer & printer scanner 21in. deep, 5 ft. wide. Center wall had centered 4.5 ft window. I plan to build 2 wall sections first, leave the Left harbor area off, build that 6 ft. x 30 inch last to left me run trains on the rest. ATSF, Southern Pacific the “key” cattle feedlot, river, near home in 1955. I have plywood for most, just need framing. & legs, like the August sectional add-on. Used RTS for XP for basic track plan, but have Kato that can fit 30 in radius loop and 11 inch smaller loop. - just thinking. It is on XP computer, and using Win 7 for access to MRR. -tom