haha, that's gonna be tons of work!
as for Little Whale, you can trust them...they make good decent tanks.
I have a custom 128g rimless prop tank sitting in my fishroom too...but it's 60*33*15 instead. It was also made right here in my fishroom, they carried them up here to my floor and did it before my eyes. You know, at first I thought that Littlewhale do take on-site job too. well, I had mine made by Nisashon...the owner was once in construction business before...so he kinda knows what to do and what not to do when it comes to rimless tank.
It looked not so safe at first but after I added water in it...I kinda felt much much safer.
It's funny that I have exact the same light (t5*4 DE) for my old 50G too. The light is great, you will love it too.
where did you get all those calcium reactor and moodlight from ? you must have paid a lot for shipping/handling cost. ??!