If going the kit coupling route is definitely what you have decided on, then my suggestion would be to also consider the Dingham type. This combines the very great benefits of the most likeness to three link/screw link among kit autocouplers, with the correct coupler position in the bufferbeam.
It is quite possible to use the Kadee type DIY mounted correctly in the buffer beam, reshaping the dropper to maintain full magnetic autocoupler capability. As with the Dingham, this looks very well on prototypes which are equipped with knuckle (Janney) couplers; simply by looking more like the prototype coupler than any alternative.
It is quite possible to use the Kadee type DIY mounted correctly in the buffer beam, reshaping the dropper to maintain full magnetic autocoupler capability. As with the Dingham, this looks very well on prototypes which are equipped with knuckle (Janney) couplers; simply by looking more like the prototype coupler than any alternative.