Lay Out Idea

I'll do my best to answer your question, but have to admit I'm a bit confused about what you're asking.  Are you saying you're not wedded to the layout in the picture and are looking for something new/better?  If so here are my initial thoughts:

-That 8 foot table depth in a corner could be problematic.  You will have access issues if you have a derailment or other issue.

-With your trestle set, are you looking for it to be a dedicated elevated line?  Or will it join up with the table level line?  If you join to the table line, make sure you have a grade that is not too steep. 4% is about max of what you should do.  That means you need about 200 inches of run (each way) to get up and down to an 8 inch track height.  If you're keeping the trestle as a dedicated line at its own level, you obviously need less run.

-Consider where you put that trestle set.  As you have it now, it's right smack in the middle and will obscure much of your layout (lines, trains, scenery, buildings, etc).  Keeping the elevated portion in the back against the walls will improve your sightlines.

Those are just a few thoughts based off what I thought you were trying to ask.  Hope at least some helps.