OK, I know that I've probably advocated against this submission as hard or harder then anyone. I've already pointed out in the other WSS threads all of the economic and historical accuracy reasons that reinforce this position. However...
This IS a "wish list", and it is Wargames Factory (the same fine folks who gave you Celtic Chariots), so I decided to take a look at what might be possible within the constraints of WF's standard sprue size and the "generic" aspect of the design. Please bear in mind, I am not an artist, I certainly am not a professional designer (or Tony or Howard), and this is the result of mostly cut, paste, trace and a little SWAG. However, these are done to proper 1/56th scale and do fit the actual sprue size used by WF.
The first sprue is for the guns and has two carriages (light and medium) and three barrels (light, medium and howitzer), plus a couple of buckets and the necessary axle blocks, wheels and carriage center plates (with elevation chocks molded in place). Remember, these are deliberately very generic in design and could be used from the last half of the 17th Century until the introduction of standardised artillery under the De Vallière system in France after the WSS. They will also work for Russian guns under Korshin's and Peter the Great's artillery reforms, which borrowed heavily from Western designs. If Tony and Howard show any interest, I can provide much better-detailed illustrations from my source materials (which include Norris, Rogers and Hogg, as well as several French sources).
The second sprue has a very generic single-horse limber, one multi-part Artillerist with an assortment of heads and open-handed arms, and one single-piece draft horse. This type of limber would have been very typical of those actually seen on the battlefield for light and medium artillery, although much of the light artillery would have been manhandled or prolonged by the crew after initial deployment. The guys at WF may be able to figure out how to make the horse a multi-part within the space constraints, but I can't.
As to how to actually sell these, well, I guess that's up to you folks and the boys from WF. They could obviously be sold as single sprues, but they could also be packaged with some mix of gun sprues and limber/crew sprues. I have made the assumption that additional crew and the actual Artillerist's impements could/would be provided for from the proposed Accessory sprue and with bits from the Generic Infantry sprue.
I have deliberately not attempted to do a heavy gun, as you could only get one per sprue, and as they would have required a larger multi-horse limber and requisite horses. Some things, I think, are still better left to metal. This would also include very nation-specific guns like the Swedish battalion gun, Korshin's multi-barrel Russian light gun and his very distinctive light gun that is gun and limber combined, and those older guns and mortars that dated to well back in the 17th Century.
So, to those "diehards" crying out for plastic Generic Artillery, please let me know what you think, and more importantly, let Tony and Howard know what you think. Have fun with this...
Sir William the Aged