I think the issue was one of casting costs which lead to a decision not to restock. Perhaps the range might be sold on at some point? I hope so as I was saving for a gate,walls & bastions for deployment in both Rhanzlistan and Bhyklabad.
An alternative might be the former Ian Weekley BATTLEGROUND range, now in resin from Magister Militum I believe. The 28mm sets would do nicely for you I think, though I have the 15mm original foam casts myself for the Sudan.