Only quibbles are-
The BAR has the WW2 M1918A2 buttstock with shoulder support and trigger housing with the "Ears" on the magazine well, and the A2 squared off rear sight. all can be fixed with careful trimming.
As to the Lewis they were only used in ground role by the US units attached to the British (US 27th & 30th Divisions IIRC) as the USMC .30 Lewis were taken away when they arrived in france for the Air Service to use.
The Mle 1915 Chauchat could be made into the .30 US version by trimming the half moon magazine off and making a new one from stock, moving the front grip
I am kind of surprised by one glaring omission. the AEF's most numerous rifle was not the M1903 Springfield but the M1917 "Enfield" made by Winchester, Remington & Eddystone. The Bulk of the AEF ''doughfoots'' carried that rifle.