As Koos says I also have a lot of items on my To Do list and but have primarily chosen to build a "fleet" of Reefers in this years Challenge. Unlike last year I aim to complete this project and if possible maybe something else but that's for another day.
The photo below shows the parts laid out as they have emerged from one of the kit boxes.

All fairly straight forward although not sure why i've got three truck frames!! (a spare I hope). As you can see the whole kit comes ready painted and decorated so hopefully all I need to do is follow the instructions and find some weathering powders!

I have found some details in one of the MRR Books "Freight Cars of the 40's & 50's" by Jeff Wilson which show one or two of these R-40-23 units although the numbering used in the kits needs to be checked out, all though to be fair I'm not after a "Rivet Counter" finish this time around. I also need to look to improve on the parts provided to see if I can provide any betterment.
Now where did I put that magnifier!!