I can't see why it wouldn't work. It should definately have the weight capacity.
I am just begining a build and plan to use this:
under >products >1-5/8 metal framing
We use it all the time in our electrical work. It is super strong and all you really need to assemble is a hack saw and some nuts/bolts/washers. There are also a ton of accessories available for corners etc...I am sure a local electrician or plumber would sell some if you can't source elsewhere.
I think my custom stand should cost around $100.00 in parts when I am finished and I am sure it will be strong enough for me to climb if I want.