Is he going to do welds? If they are sanitary it's worth it. Maybe so if not. I know weldless bulkheads cost at least $20-30, a stainless valve may be like $15, a thermometer cost maybe $30 and i haven't priced a sight glass.
Assuming all stainless:
3 bulkheads - $60-$90
Thermometer- $30
Valve - $15
Nipple, hose fitting - $7
sight glass ~ $30?
false bottom ~ $30
Just an approximation off the top of my head, it's probably in the ball park.