Layout is basically 16'x 8' with an 8'x 8' off one side. Its all I can really fit in my basement unfortunately. On a positive note, it makes things a little more manageable without having "too much" layout(if that's possible)and I can probably get things done.
So far I haven't installed pop ups yet for access and I've been crawling on top of the layout to get at the hard to reach places. That's why I made the bench work out of 2x4 for framing and 1/2" plywood top.
It seemed easier to do foamboard as opposed to the "cookie-cutter" method of grade work, as mentioned by Carl.
I did have to eliminate the one siding on the top main where the reverser loop was, due to actual space constraints. It looks like the grades will be tolerable with most of my motive power and the fact that freight trains will be only 8 or so cars in length.
I will be constructing some bridges and trestles so it wont look to closed in, down the road. Priority is to get trains running and then pick and choose what I feel like working on.