Please, I need a How-To" article on this unit. Figure sources, etc. Thank you in advance - delightful!
Want fries with that?

I've done these over quite long period of time so I don't quite remember. Plus sculpting isn't all that easy to teach, IMO, since it is not an intellectual but a creative process; it is in the fingers.
I can give you a run down on the minis and tell you what I changed.
The Volunteer Grenadiers are Great War Miniature British bombers with caps and jerseys sculpted on them.
Wooster and Jeeves are Musketeer miniatures. Wooster's knickerbockers are re-sculpted to cricket whites, Jeeves is straight out of the box.
The HMG (which incidentally sparked the whole idea) is a Renegade early British Vickers.The gunners got greenstuff caps, jerseys and scarves. The pile of spent shells are very short lengths of 0.4mm brass wire.
Maisy and Hudson are Artizan Thrilling Tales, the Stokes mortar (which is quite simplified) and tea cart are soldered brass with plasticard and greenstuff details. The grenades are bombs from an aircraft kit so not all that accurate.
The crossbat smiters are from Hasslefree and Foundry (a special shoutout here to Svenn, who has pimped specific lead for me I don't know how many times). Pads, cap and helmet are sculpted onto them. The handgrenades are 1/35 Italieri, so too big, really, but you hardly notice since the scale difference is hard to notice in small detail.