And I have an interest in the following and shall update the information when the final statements are to be added.
In this current version of the theory, Plambeck is basivcally updating Mackal's theory to fit the giant salamander model better.He still says (as Mackal did) that the reports of the long neck must mean the tail sticking out of the water. As in the case of Mackal's original statement, this simply will not work because the head is definitely stated to be at the end of a long neck on several occasions.
I DO still agree that giant salamanders are found in the British isles including Loch Ness at least formerly: and in fact they are sprinkled here and there at various places all over the Northern Hemisphere (Which is to say they have a Holarctic distribution, as their Miocene fossil forunners also had) However the larger creature seen at Loch Ness does have the longer neck, as explained, and using Plambeck's reconstruction while switching the "Long tail stuck up in the air" for a long neck (With a head of this specific size and shape as shown below, also covered on this blog recently)
the end result is once again remarkably like the other standard reconstructions such as Dinsdale's and Sanderson's (Including my own, with pretty much the exact same specified dimensions):