Hi Bill. Thanks for the input. I've been wondering about the config for the Reversing Engine foe a while now. The version currently added also shows up in the technical volume of TTSM. However, I initially went with the version you mentioned which is the one that is visible on the Britannic, both in photographs and in plans. given that there were clear differences between the Britannic's engines and those of her sisters I didn't have too much of a problem with the version I went with. But...I am inclined to revisit that choice in favour of the Reversing Engine you point to. Fortunately, I have that version partially built, so it's not a huge amount of work to do so...it's no harm to have both versions and my suspicion is that you are correct on this...Excellent work Cian, I've been admiring it for some time. Your handling of the texture is impressive, the painted castings look photographically real.
Two items for thought:
-the reverser appears to be based on a page of Sothern's circa 1936 "Verbal Notes" book that appeared on the old TRMA forum. Unfortunately the manual pump, selector switch and the casting bosses for the pipes from the pump are not in the H&W photo of the Britannic engine. The ships instead had steam/hydraulic pumps on the aft engine room bulkhead for operation of the reverser during engine maintenance. I've not found the interconnecting pipes illustrated on any drawing or photo however.
-the Britannic's engine was lengthened with an extra crankshaft bearing between the HP and IP cylinders. This left room for a catwalk over the bearing, it shows in one of the shop pictures. There is no catwalk over the other bearings however and no similar catwalks at all on the Olympic or Titanic.
Regarding catwalk accross the lower engine, I'll come back to that when I have more time if you're ok to discuss?