You are very lucky to even have a space like that to ask for. I would respectfully suggest to you, as others, I would construct it in smaller sections that will allow you to transport. At your age, you are going to be moving a lot, before you are ever situated somewhere. The average American moves every 3 to 5 years.
Also, you have arranged track to fit the space...so what is is suppose to be? A growing number of very well done and impressive layouts are DESIGNED so that they depict something real (prototype) or are based on real life railroading.
Any plan is more interesting if it has a back-story--even if its made up. A DESIGN should include the: Who is the railroad? Where is the railroad? Why is the railroad there--what is it doing? And most importantly, what are you, and others doing, to be actively engaged in the operation of the railroad?
People have discovered that when they provide opportunities for others to operate the train (I'm not talking about turning the power on then standing there and watching) by actually controlling it picking up/dropping off cars and sharing common track with other trains, a layout is more challenging, interesting and fun to operate.
I read that when I was a teen and it took about 20 years to finally sink in.
Good luck...I'd use the old: Mom and dad, I really love this hobby and I really want to do this. May I please? Please goes a long way. I hate it when my kid uses it on me, because it works about 99% of the time.
