My garage setup- readying for an Opel Manta build

Looking good - I know you've already upgraded the lighting and painted walls white which will help illumination but if it was mine I go a little further

I'd Plasterboard the ceiling (or OSB if easier) and paint it white too

Lay loft insulation on top between the joists to the depth of them

Then board out the area above for a bit of extra storage - roof trusses look a good size so useful storage up there to keep walls clear off and minimise the need for cupboards

Put a removable hatch to secure (and also insulate it) - link up the lighting so you can have a switch to turn on a light in the loft (helps to spot what you need when you've lost all the light from below)

Enjoy a much warmer garage in winter (that requires only a small ammount of heat to warm it up)

Better still a much cooler garage in the summer that doesn't suffer from heat radiating from the roof tiles

I have a slightly larger/taller loft area but I've got 2 x wings, 4 x doors, 2 x seats, a motorcycle in bits, 3 sets of wheels, Some car glass and a whole bunch of tote bins with spares in them - I'd struggle to move without that additional storage area and I'm bloody sure I'd have accidentally smashed the glass years ago or splattered them with grinding sparks