The kids and I built a couple of these using the Vasconia pots.
We put two grates in each one. The bolts for the top grate are 1.5" down from the top lip, and the lower grate bolts are 5.5" down from the top lip.
This config gives 4" of clearance for each of the grates.
We mounted the thermometer just below the bottom grate.
My Boys: Joseph (EI); Andrew (EE); Daniel (EE)
My Toys: 10 WSMs (B, C, DH, DA, EZ, DZ, EO, DU, DR, EE/DU mutt); Brinkman Cimmaron; Chuckwagon Cooker; 22.5" OTG (DT); Two 22.5" Bar-B-Kettles; One 18.5" Bar-B-Kettle; Smokey Joes (A, K); Genesis Silver C (DU); 3 WGAs (EZ, DE, N); 3 SJPs (DT, DU, DR).
"For when democracy becomes tyranny, those of us with rifles still get to vote"