4x4's are generally more expensive then 2x4's so I'd stay away from them.
You can easily achieve the same results with 2x4's

Heres an actual model of the frame on my tank to give you and idea to work with.
http://members.shaw.ca/kabong/frame1.jpg


Oh and just in case you did'nt know 2x4's are actually 1.5 x 3.5.

thanks. gives me a good idea on how stands are generally done. i'd want my corner posts face to face though to create the ledge i want for the plywood and styrafoam :) the rest looks pretty much the same

ok well, i think i'm going to end up building the stand before we move and just tossing it in the furnace room til moving day. there's a ton of spare 2x4s upstairs. my husband says he'll start on it tonight. :) i'll take a pic and all when it's done and show you guys. i sure hope it works out the way i want it.

i think it will work out fine, i kinda know what im doing. lol.
I built the in wall stand a while back for adidas, if any of you remember almost a year ago... he has a 120G.

It's easier to move loose 2x4s then fully assembled stands :)

yeah but the stand needs to be assembled before we move because we can't build it on our moving day because all the tools are where we're at ;)

that makes sense