Keeping it simple and modular!
This will give you a bit of challenge when parking your train!
I dont like either of them because you are limited to the direction of travel. I would imagine you have something with electro couplers and can run the engine around. It also doesnt interfere with your outside 60".
Both of these fit your original size restriction. All interior sidings use your readily standing free parts.
On your note of going up, the trestle set... I own one and it is NOT conducive to being repeatedly taken apart (especially if you dont like having your fingers cut!). I've already broken the retaining tabs that join the bars on some sections.
