I think staying away from the maths might be my next step on a lovely Sunday morning too!
I want to stay away from maths altogether!
I have wanted to build the early GER ballast wagon (diagram 39) from Ragstone Models for a while but I couldn’t see a decent excuse to include the model in the project. The LT&SR horsebox has rather changed my outlook, because this was built to a GER design. It therefore seems fair to suppose that someone (even the GER themselves) could have supplied ballast wagons of the GER design to the Heybridge Railway.

The kit seems very reasonably priced, but then again it provides just eight castings, some styrene to make the floor, and two couplings. The castings for the axle guards are really crisp and need hardly any cleaning up; conversely the long sides are distorted and need work.

I have built the model around a new floor of 0.25 mm brass. There are so many different angles involved here I cannot comprehend how anyone could build the model with just the cosmetic styrene floor.
To begin I soldered the sides along just the edges of the floor and not up into the corners. I have minor errors along the solebars (they are spayed outwards about one or two degrees) and a fairly tight arrangement of the four corners of the sides.

Then I twisted the ends of the sole bars (the dumb buffers) into their final alignment and soldered up the corners.

With the soldering confined to the areas near the floor, the sides look as though they can drop. The lack of a physical connection at the corners also means I could curve the long sides outwards so they look a bit more natural. Three of the four latches for the doors broke off during assembly and I cut the fourth one off for completeness.

I am going to try to paint this model before I add the wheelsets, see how I get on. I have started with the easy bits.
As someone who craves right angles and straight lines in their models I have found this build to be a bit of a challenge. I spent a lot of time fettling and trying to straighten the sides but however hard I tried I could not get things to align completely to build a wagon in ex-works condition. This is probably a good thing and the wagon with its curving sides now looks a bit "used". I have learnt rather a lot here, more than the photos show.