I can use 1/2 tracks, but the top configuration will simply NOT fit in a 5' width, at least not using O42 tracks. The combination of O42s and those straight tracks in the top crossover pushes the lower part of the layout outside the lower part of the oval. As a result, the combination of O27s/O42s in the right reverse loop didn't fit the space available for it. The only way that would fit is if the O42 crossover worked. I did manage to use O42s on the left side in the inner oval though.
The tracks in the expanded upper reverse loop didn't fit the way it's designed either. They might actually fit when put together, but they weren't close enough to join in RRT. I tried all kinds of variations, but couldn't join them close enough for a simulation to work. They weren't just short, they were off center too much.
At any rate, I was able to change the configuration of the spurs, etc., and this is what I came up with. Curves and turnouts that aren't marked are O42. The grade in purple is 3.3% and you can see I stretched things as far as I could. If you move the upper reverse loop a little to the right, the grade increases to 3.5%. Personally, that is what I would do to avoid covering the turnout on the left side.
I also feel I had to use too many short straights, especially on the top left, to make things fit and maximize the use of space. Standard straights might fit when you actually put things together. You can also squeeze things together by moving the lower reverse loop a little to the left and then moving the ovals on the right side in a bit too. I tend to push things to the edge and then adjust as I add landscaping/scenery.
