He is marking the red leg as 1 pole 208. That would be a no no. It should say 'Do Not Use' for single phase line to neutral load. I believe the nominal voltage at that point, red leg to N, is like 183 V irrc.
I like Larry's idea of not taking any 120 Volt loads out the 400 A delta MDP. You can try to balance the loads by taking the lighting out at 240 V single phase with two pole breakers, but I do not see that on the drawing. The equipment schedule does not look like a lot. It looks like they don't make much more than coffee and toast.
One thing comes to mind. I seem to recall some weird piece of cafe equipment that had 208 V single phase with a neutral as the feed. H, H, N, 208 V. It might have been an ice cream maker with a separate countertop machine and a rooftop unit. I wired it and changed the breaker from 3 pole to 2 pole without any thought but the plumber was making jokes about seeing the last one go up in smoke.
If you get something like that it could be trouble if it takes a 2 pole breaker and a neutral. You would have to be sure the 2 pole breaker is not on the red leg if the load takes the neutral.
Anything with a drive in it would have to be checked also. The drive is usually specced for grounded Y, the drive front end is usually grounded Y. You would have to check with the drive manufacturer for their instructions about having a delta supply. It can be done but you have to be careful. Some of the loads may be expecting a Y source.