Barb, try a single engine with another smaller cowl between it and the bigger one!
As an additional idea, I suggest making a cross-like support structure around the round engine, which you could mold into a set of fins (either to the side, or wherever you see it fit).
When that's done, all that's left will be to do a large effect for it with the ALE's and in the end we will have a great Ranseur!
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