[JasonB]

As Andy has mentioned, you might want to take a look at the J-Trak system, which would allow you to have a copule of extra boards stored away so that you can change your layout every now and then.

These layouts are roughy 3.5m x 2.5 m, but obviously you could change the table size to fill your space. They are analogue modules, but there is scope for adding digital pieces.

       

A single lane rally track, just for a variation.

   

If the modular approach is not your thing, then here a couple of other suggestions.

I always find T shaped tracks difficult to design, because the leg of the T always seems to make things awkward. However, if it's possible to make your layout more triangular, then more options open up. This one is 3.7m x 2.4m and has a 20cm elevation change, rising towards the back of the layout.

       

       


This one is actually larger than you have space for, as I started it before your update. But it could probably be adapted. It's 4m x 2m, and has an elevation change of 50cm. It  should probably have another lane changer at the end of the bridge.