Your paintjobs are awesome!! I own the 1/32 arty set as well (not the limber) and I also have the Quadriga (which is more in a 60mm scale). I didn't paint the quadriga as it is unstable and I always have trouble trying to heatpin anything in soft plastic. I understand you had similar difficulties (unstability).
The overall fit is excellent.
What I don't understand is that Italeri uses a glueable plastic on their 1/72 figures (since last year) which actually works, but they do not use it on their 1/32 sets.
May I ask how you connected the horses to the base? Any heatpinning involved??
PS a supply convoy will be released soon in 1/32, might be of interest to you.