6×4 isn’t big enough to work in. The work stand will fill the floor area without a bike on it, you’ll the struggle to get to the other side of it, it might work with a wall mounted clamp stand, but they are a real compromise because it only gives access to one side of the bike.
Add in even a small tool box and then a small table top or shelf to put the tools your using. A bit of storage for the spares box and a few tyres? You’ll be moving the work stand outside to work on the bike.
I’ve got an 11×7 bike shed. 5 bikes are stored at one end, spaced so no bike jenga to get anything out. The other half of the shed is racking on one wall and a bench with a roller tool box underneath on the other. I’m outside with the work stand to do any work.
If I changed it to a workshop only with just bike tools and spares with no other bikes in it, then it would be OK. Tight, but OK.