Locked looking for help on wood boxcars ca 1934

A&Y Dave in MD

I'm interested in understanding the differences between the various groups of boxcars listed in my copy of the 1934 ORER (see attached PDF of scan as well as my transcription of what I think are key data points in Excel).


I'm somewhat familiar with the 36' variants due to the Westerfield resin model kit and it's instructions, plus some of the info in Ties and Southern Rails.  I know a lot less about the 40' variants (which is really a misnomer since there are so many different lengths.  


I'm happy to take this off list, but I need to know who is interested and capable of helping me.