You'd think at that angle the barrel would be visible. Same for the one in the Mid East wars book.
I wouldn't be surprised if they converted some of their own "defrocked" priests - think it would be a nice project, though better if some more IDF figures were available to fill it.
Mark - have you built an IDF Priest? I wouldn't mind having a go but know little about Priest evolution. Would it be a simple case of a suspension change on one of the Dragon kits? Also I saw your IDF Monster over on idf-modelling. Very nice job