Jonathan will be the final arbiter of this, but since I went through the same process recently, I can advance what I believe to be the answers.
Thanks to covenant specialists and resources, your lab automatically comes with the following buffs:
- Superior Construction (Free Structure Virtue)
- Superior Equipment (Free Outfittings Virtue)
- Superior Tools (Free Outfittings Virtue)
- Size +1, and Spacious (Minor Structure Virtue)
Anything else will need to be installed by you using seasons of work, unless it can be argued that it would have reasonably been there before (in which case it costs Build Points, which I believe you've allocated). Otherwise it would be two seasons for the Greater Feature (getting the Greater Focus along with it), another season for the Refinement, and another season to install Living Quarters. (Getting rid of Spacious for another Minor Virtue wouldn't take any time above the time needed to install that other Virtue.)
As for Upkeep: the arrival of Roberto and the five grogs is going to lead to a 40-pound-per-year silver shortfall, which we are going to have to find a way to deal with quickly (since our reserves will be on the order of 10-20 pounds most likely). Changing a lab from Upkeep 0 to Upkeep +1, +2, +3, +4 costs (assuming average lab usage) about 1/2, 2, 5, 9 pounds of silver per year, respectively. So if our solution to the 40-pound shortfall actually nets us 50 or 60 pounds, then you can go nuts as far as Tranquillina is concerned!
On a related note, but this one's for everyone: Viscaria had planned to enchant magical items called Lamp-Lighters and Hearth-Starters, which were intended to provide the Magical Lighting and Magical Heating Virtues to the Mons Electi laboratories (as well as its cool in-character effects). According to the magi planner, she was going to complete the Lamp-Lighters in 1225.3. Is this still happening?