Aegis21 posted:Here is an updated, more precise drawing.
I don't see the pole as a major problem as long as we know exactly where it is, but the wall dimensions still seem off. The Green wall at the top is now marked 10' 10" and that is where the Red wall is. The Purple wall in the center is marked 18' 6", but they don't add up to the 28' 6" length of the Black wall on the bottom. So either the Green wall is really 10' and the Red wall needs to be moved to the left or the Purple wall is only 17' 8" to make the total length 28' 6".
On another note, I've always assumed you'd want a dual main, I just thought it was too early to offer layout suggestions. I added the O72 track and O54 reversing loops just to provide some perspective of the space.
While I agree with using the widest cures you can, I wouldn't let that influence what I'd "like" on my layout. My first inclination is list everything I'd like and then see what will fit with different track sizes and configurations. But then I don't really care too much about how my engines look running around when it comes to engine overhang. 
If I need to use O54 or any other size curve to get what I want on the layout so be it. I do shy away from anything tighter than O36 even though all my equipment is rated for O31.
And while I also agree with the idea of wide aisles, that really depends on how many people you expect to be involved in operating the layout at any given time. I've visited 2000 sf layouts where the aisles are 36" throughout and was able to move around easily enough. Of course, that was just 5 adults walking around looking at various elements and not operating. If you plan to have grandkids playing engineer, then deleting the 6' wide peninsula might be a good idea, but that's completely up to and I think you're far from making that decision. My inclination would be to leave it in, but design around it unless you need to use it for something specific.
Along the same line, I agree with Carl's suggestion to use 30" deep decking and only add the extra 6" where you need to, like to add a yard, passenger station, etc. If you place track close to the wall and elevated, 36" can be too far to reach to lift a heavy engine or repair something.
