thanks for the input! i'll try to post an update soon with the stand, i've started the build. nice to see i'm not the only one with upgradability in mind :fun2:
while looking around, i've found a similar build ( hope no one mind links to other forums... )
http://www.thereeftank.com/forums/f161/210-tank-build-157946.html
first picture is a bit similar, but in my case, ( and before seeing your comment, i built the upper fame in 2*6 only. ) support beam and brace are 12 inches off the sides. 3 braces total in the upper frame, one midle and 2 to support the 48" tanks.
Nice idea on the rear frame, not sure if i'll adapt mine for it but it could be usefull for many things like to hang the reactors... Why were the bags legs in the way? ( okay, my 65 is on the worst marineland stand they have so i'm not used of having room to work with in the first place... )
your sure the front 2*4 could support the tank? recommendation on the first page was 2*6 for 48"*24" tanks. maybe with the actual picture it would be better