Going Rimless?

[YEGReef]

I know this has been discussed many times and the answer is always you're taking a risk converting a tank into rimless, just thought if I could get some opinions on my tank and situation.

Picked up a tank for free from a member who had it up and running for about a year, just emptied today. The issue with the tank was the trim on the top and bottom were broken/cracked. Went I got it home, the trims could literally be pulled right off.

Dimensions:
35 Gallons
36" Wide
12.5" Deep
18" High

The front and back glass is 5mm, the sides are 6mm.

I was planning on redoing the silicone and keeping the tank rimless.
It will only be full for about a month or so, a temporary home for about 5 fish until I set up my new tank, then will be used for a Fire Belly Newt so about a 40 percent filled, with of course styrofoam underneath.

Opinions? Is the glass thick enough, is the tank small enough, I plan on gluing a cross member from the front to back on the top.

Thanks

[Razor Ramon]

Sounds like the tank is old if the plastic is cracked , usually there is a production
Sticker on the bottom .
If the tank had no leaks I would cut all silicone out with out cutting between the pains of glass and seal it up ,home hardware sells 100% silicone that states aquarium safe.
If you want David at Aqua Gaint can cut small prices of glass on the spot and ,you could urobrace the top.
5mm glass is thin for holding 350 lbs of water .