I was hoping that somebody else, (somebody that knows how to post pictures and show you what he's talking about, that is), would answer your question. Since no one has; let me try. I've added recoil and an IR emitter to two of these turrets, and both times used parts from a Tamiya King Tiger.
To make the barrel elevate & depress, I replaced the Asiatam trunnion parts entirely. I cut away the pivot-point mounts from the Tamiya turret (on the Porsche kit they're on the turret bottom plate, and on the Henshel kit the're on the turret front plate), and transplanted them to the inside front of the Asiatam turret. I used the 'F' parts sprue from the Tamiya kit to give me a recoil-plate mount:
http://www.ebay.com/itm/9005707-Tamiya- ... 406wt_1399
The first time I used a stock King Tiger bracket and recoil unit, but these are really large in this small turret. The second time, I used front half of the same bracket to mount to the pivot-point, but cut the bracket and 'spliced' the rear half of a Panther bracket and recoil motor. It was a pretty Mickey Mouse way to do it, but these are designed to be a lot smaller, and gave me a little more room in the turret to fit in the 'apple' base under the cupola.
For the IR emitter I bought one of the IR tubes from ETO that Daryl Turner makes. I drilled out the gunner's sighting hole in the front plate of the Asiatam turret and epoxied the tube so that it's flush with the front plate. It does not elevate & depress like the main gun, but I would rather have it this way than to use the 'afterthought' part that clips onto the outside of the barrel
I don't know if this helps or merely serves to confuse things, but PM me if you need a better explanation. -Mike