Thanks Dustin - it can be a challenging build!
Now it's time to move on to the gun. When I first opened the box and inspected the contents I was impressed with the level of detail on the gun - I thought that at least this part would be a straight OOB build - wrong! Comparing the gun details (or lack of) to my references I started to notice immediately that a lot of work would be necessary to bring it up to the level of accuracy that I wanted.
So starting with the recoil slide one immediately notices the large number of rivets on the exterior but the complete absence of rivets on the inside surfaces. So my first task was to laboriously glue a couple hundred (I'm exaggerating although it didn't feel like it at the time) rivets from my spares box and some kits that I never intended to finish onto the interior of the slide.

I also added a small rod on the left side - I'm not really sure what its purpose was. On the exterior right side there was a ruler that measured the amount of recoil of the gun - why this was important I'm also not sure. This was molded onto the recoil slide so in order to make it look more realistic I sliced off the molded version and scratchbuilt my own:


I added the gun barrel next.


Added a few more details to the recoil slide and trunnions:

I also redid the two small pulley wheels on top of the trunnions:

Next item was the gun carriage and mountings. A lot of work was done on these parts - almost half the rivets you see in the following shots were added by me. There were a few parts that were added that were not included in the kit - you can see them in the photos:

Here's a close-up of the left side showing the large metal board on which was posted a table for determining the amount of charge and the gun elevation necessary to deliver a projectile to a certain distance. The part included in the kit was too thick for my preference and I replaced it with a scratchbuilt part:

Those of you who are familiar with this weapon will note the absence of the sighting device. I will add it later after I paint the main gun and the sight separately. The mounting for the sight and the two parts that link it to the gun are present, however. It should be noted that the instructions reverse these two parts so beware if you are building this kit - I had to resort to my references to determine exactly how they were arranged (in fact, I had to do this a lot with this kit).

And a view of the right side:

Note that I also replaced the four flanges supporting the recuperator with pieces cut from thin plastic card in order to get the right scale thickness - the parts supplied by the kit were way too thick (you can compare the kit-provided parts with my own by looking at the photos at the top of the page and comparing them with the last four). And that's all for this post - hope you find this interesting and informative.