Tank repair

Question
I picked up a 40 gallon tank, measures approx 12"d x 36"w x 24"h.  It was free, but is damaged.  The glass is good, a few inches of water shows the bottom area is tight.  However, the bottom frame is broken; the part at the end of the tank is missing.  If I set the tank on a firm, level surface, will the stress on the end where there is no support cause a problem?  Also, the top frame has been modified.  I believe the plastic "bridge" linking front and back areas of the trim has been removed.  The remaining trim has been ground fairly smooth, but I can see that a connecting part is missing.  Upon further investigation, I notice there is excess silicone under the trim in the area where the trim has been ground smooth.  I believe there was a connecting piece of glass there which is now missing.  Can I purchase a piece of glass (what kind, what thickness?) and silicone it in place and expect it to actually be strong enough to prevent spreading of the sides near the top when fully loaded?  I'm doubting that an aftermarket repair could have anywhere near the structural support for the tank as well as the original parts.  Would there be any benefit to using a substantial piece of plastic and JBWeld it into place so that the top trim could help hold the front and back glass pieces together?  Maybe it would be better for a terrarium at this point--

Answer
Hi Dwight
Saw your question in our question pool.

From what you've described, I'd say terrarium it is then :)  Would you want to risk 40 gallons worth of water on your floors?  My opinion, it's not worth the risk/damage.  With all those parts missing-the bridge part on top and the bottom frame, yes it could cause stress on it.  When you buy a new tank, there's usually a sticker/disclaimer on that top "bridge" piece that says not to remove it because it's part of the support frame.  
At least it was free.  

Christy