That’s really cool to see done professionally, great job. I’m removating my garage ceiling attic for storage and my vertical rafter ties are at the first 2 feet, would you suggest that I use a large beam in the middle mounted to the floor as well as rafter ties blocking and vertical rafter ties for it. (Btw it was built in 1980 so the joists aka rafter ties are sagging, wavy and are nailed together in the middle)
I would suggest getting an engineer involved. Money well spent to have them review and give a professional opinion on your specific rafters. Knowing they are sagging tells me something isn't right and probably needs to be corrected before you start using for any storage.
