Framing to sheeting---doing the framing(building) sheeting(sheathing) needs to specify roof and wall
Slab on grade daylight---Just a slab-no footings below frost grade, on existing grade, he won't dig or level it. Daylight usually is open on one side(back) rest is buried in hillside with concrete walls. Wrong application here.
6/12-pitch truss roof---Means 6/12 cut or rises 6" in 12" horizontally
12’ plate heights--- Studs and plates = 12' total
Square garage wrap--- in top corner detail as opposed to 45* corners, wrap is the trim-jambs and head boards
Plumb cut tails--- end of rafters past building are cut vertically.
2X4 sub-fascia with 4/4X6---2x4 nailed to rafter tails before trim, 4/4x6 may be look-outs to hold up barge rafter
Exterior soffit backing--- only installs the backing member horizontally at the building for a closed soffit
Strip wrap and set 4 exterior windows and 2- 3/0door---installing and weatherproofing the windows and doors but no drip flashing
You get to finish everything he doesn't mention, a lot! The roofing, vents, barges, rake trim on roof, closed soffit finish material, vents, window trim, finished siding, blocking for same, flashing, footings- required by code in CA, flashing over windows and doors. He is doing about 1/2, make sure to get a permit as his quote is very lacking in detail. Get 2 other estimates which will be a lot higher as he is leaving a lot out and only sitting on a slab. Be safe, G