Petco says no to 30G tank in the dpg sale.
I repair and rebuild tanks and the short answer is yes it can be done. Note: There are no advantages to fixing a 30 gallon since you can buy one new at petco for $30 when they do the buck a gallon sale.
I have never seen petco sell anything besides 10g, 20L, 20h. 29G
. 40B & 55G.
and they charge tax for the full retail so for about $30 @ a dpg sale you are limited to 20 gallons.
since the OP has most of the materials, and if its done right & tested .it should work out.