If you are going to do BIAB, you don't want that thermometer in your pot. The thermowell for that thermometer sticks 1-2" into the pot. At that height, that means a 1-2" probe that is going to slice and dice your BIAB bag.
I have done BIAB for almost 2 years now with the 44qt Bayou Classic with the perferated basket. This is really the ideal setup for BIAB. You can drill your own hole for a ball valve in about 10 minutes for about $50.00, including the step bit, bulkhead, pickup tube, compression hardware, and ball valve - all stainless steel.
It is SIMPLE to do BIAB when you can drape the perferated basket with the bag instead of the pot itself. The perferated basket sits 3" above the bottom of the pot, so it protects from scorching. When my mash is complete, I just lift the perferated basket out of the kettle and rest it over another kettle (some use a fermenting bucket) to drain. I also press it with the lid of a smaller kettle to squeeze out as much wort as possible without ever touching the hot grain.
Get the 44qt Bayou Classic with the SS basket and you won't be sorry! That Birdman kettle is great quality and perfect for traditional brewing, but not ideal for BIAB brewing because of the thermowell.
The company that imports the Bayou Classic kettles is called Barbour International. They sell the kettles direct about 15% cheaper than most Bayou Classic retailers. Here's where I bought mine, about $107.00 shipped with the SS basket:
IM me if you have any questions or need any help sourcing the hardware to add your own ball valve. Good luck!