So, with all respect, what type of tank assembly have you done before. I went from putting together many sumps (all of them done incorrectly as I later found out) to a 180g display and I can tell you it is an anxiety testing experience. At the least, I would recommend two people for the job.
Also - I saw your PM for the stand (although most was cut off), but if you need, I have a full Tig / Mig welding setup and a great source for powder coating (e.g. the blasted and costed my entire stand for $100). For steel supply, I would say DenCol - sane prices and convenience.
Shawn