to tell you the truth, i don't know about the sturdiness of that container

you have to take into account everything thats going in there, (im assuming you want
LR, sand and
Macro algae??) Thats alot of weight and it almost looks like that container is already starting to bend without anything in it. It may be more beneficial to get a container that is alot thicker than that one.
OR if your intent is to use that one, which i would do with the baffle already in it, you could build a word structure on the outside of the container, that will fit the container perfectly. This could take alot of the stress off of the container and put it on the wood structure itself.
But if this is not an ideal direction to go on, just start off fresh with a brand new THICK container.
Hope this helps
__________________
Josh Small Frys 120 Fish- 2 Percula Clowns, Hippo Tang, Flame Hawkfish, Black fin Shrimp Goby
Coral- Green and Pink Frogspawn, Colt Coral, Zoanthids, Green Acropora, Fungia coral x2, Millipora
Clams- 1-4.5" Crocea Clam, 1-6" Maxima Teardrop
Cleaning Crew- 2 Skunk Cleaner Shrimp
2 Peppermint Shrimp ,20 Tiger Trochus, 5 Blue Legged Hermits
RIP Victims of the massacre :