Anxious to have more progress done on my model!! I like the way it is coming along, considering my having to "estimate" the scale and what dimensions the actual gun and car were. Have found some dimensions, but not all, and as stated, still looking into locating more details on the gun car itself. Still, to have a larger railway gun in my consist will be nice. This is my first crafting of any car from complete scratch, and learning a lot as I go along. Really was going for a more RTR gun car when I started. But, now, find myself making changes as I go to be, hopefully, more close to "scale" and more accurately detailed. Even considering having the recoil action and the recoil/recuperator cylinders functional. Also, thinking of the carriage/firing bolster elevating screws drives "somewhat" functional. Whatever, I am enjoying the effort and know the final product will be ok for my military consist.
Jesse TCA