Nice work on the kettle, Leggoma! I'm looking to possibly do something similar soon. Do you happen to have a parts list for the modifications?
One mistake i made is that the thermometer probe is a tad too high. it sits like half an inch under 5 gallons. I think when I was filling it, i may have added an extra gallon mistakenly and placed it for 6 gallons.
I think it will be ok though. Worse case scenario, 10 gallon batches.
Parts List: (all on amazon) Again, I bought all the parts like a year, year and a half ago at slightly cheaper prices, but the following is still pretty cheap for a 15 gallon setup.
kettle - Thunder Group 15 gallon aluminum kettle
ball valve - 1/2" Weldless Bulkhead w/ Stainless Steel valve
thermometer - Thermometer- 3" Dial with 2" Stainless Probe (not the exact one, but similar)
thermabob kit - Weldless Thermabob Adapter
drill bit - Neiko Titanium Step Drill Bit - 1/4" to 1-3/8" in 1/8" Increments, 10 Steps