@Mark Boyce
Yes, I agree with you and @ScoutingDad in regards to not over worrying about the calculations. To everyone that has given their advice/ ideas/ experience/ input - thank you! I greatly appreciate it, as it definitely gives me a better sense of how to approach this. When I think about it, I think the correct thing as it has been pointed out, given the amount of space I have in that spare bedroom, I should go with a mix of 036/042/054 curves. I will keep the scale GG1 that requires 072 for a later date, when I might be able to have additional area to build. I did purchase last night a Williams scale GG1 that will run on 042, so I'm excited about that.
Yes, @gunrunnerjohn, you're absolutely correct, I really didn't give it much thought as to accessing the layout other than crawl under/ over... hey, I was on a roll and I figured why stop, ha ha! The 4x8 section in the foreground, I'm going to cut it in half length wise and move it to the right, and it will fit in as an "L" section to the 2x8 section up on the right wall.
The other thing that I have discovered last night is that SCARM doesn't work with Mac O/S ... does anyone have any suggestions for a program that will work with Mac???
Thank you again to all of you for your experience/guidance!!
Steven -