PROJECT DREAM RAILWAY

I wanna say around five or six years ago- I was probably 12 years old -I had a dream of having a large model railway in my basement, complete with HO track and all. Now with this dream, I had these obstacles in my way - money, space, strength/age, and those damned curves the electric tracks had (the large curves meant they'd take up a ton of space). While cleaning out my computers files, I stumbled across my old plan I created many years ago, in the form of a scanned blueprint. This drawing is attached.



Looking back at my position now, I realized that this dream of a railway with self-operating trains COULD happen....in the form of those glorious blue plastic tracks...

I chose Plarail for a number of reasons, but the one that strikes me the most is the fact that pieces are still in production, and new products are being issued regularly.

On the map, each line is a single set of tracks. Given we are working with Plarail now, this could be expanded and modified. Each large square is supposed to be a folding table.

Does anybody here use a planner (or design their layouts) prior to construction? I would love to hear your opinions!
If I stick to this plan, how would I incorporate additional elements such as Roller Coaster Mountain, the Shaking Bridge, and the Gigantic Thomas tunnel?

Thanks a million everybody!