Alright hang on to your pants cause I'm about to drop the SP bomb on y'all.
I have a GS-2, GS-6 and GS-64 megapack coming out soon on The Backshops yes, these are payware. Price has yet to be determined. We are currently waiting for licensing from UP before it can be released. And yes, you will be able to use PayPal to pay. The pack includes all GS-2, GS-6 and GS-64 engines in multiple variations and a full 1937 Coast Daylight consist for them plus the additional cars that showed up later on the train. I've also got a SP Lark set coming out later using these cars, but I've still got a lot of work left on them before I'm ready to post any pictures of them.
Aside from the content listed above, I've also got a GS-4, GS-3 and potentially a GS-5 as well in the works. Right now I only have 4425 finished for the GS-3s and 4449 for the GS-4s. The roller bearing bogeys are done for the GS-5 but I haven't gotten them in game yet. Right now I have 4449 in her 1980's era appearance. Still on the fence about whether I want to keep my GS-4s and such private or release them, or if there is a demand for them or not.