Would some of these modifications be applicable to the 51ft stock?
I refer to the panels and brake sections...
The end profiles could be corrected, using the MJT ends as templates?
Most of the kits I have are 51ft ones, destined for my CLC project.
Embrace your "mistakes" as friends and teachers. It is through this you will improve incrementally as a modeller.
We all begin; it is then how you wish to progress...