I would like to have the Gatling Gun at Repeating Weapons (where the Machine Gun is now) and then the true Machine Gun at Automatic Weapons. They may be a bit close together, but you do have to get through Artillery and Industrialism to get to Automatics.
That sounds perfect, after all cumbersome gatling gun was semi automatic and had to be cranked to keep firing. The space between two is accurate, they weren't that far off. Some decades.

Btw, has someone already suggested that waterwheels could be made up to something more modern by workers at modern/above times ?
And what about those grenadiers/modern grenadiers ? Are they going to get range 1 ranged shot ? I think at least modern mortar/heavy mortar teams shoud have accurate range 1 goodies are age where artillery already fires 2 spaces away. Maybe they could hit to that nasty first unit that always evades artillery.
Come to think of it, it really is unrealistic and stupid that artillery never hits the first unit.