Reply to "What Engines are Upgradable"

I can speak to attachment. My second command engine was a Kline RDG F3 AA unit. The trailing unit failed and it got caught up in Kline's demise and it was returned a year later. When tearing down the layout for the solar installation and rework of the basement ceiling water pipes, I found it under the table. I had it converted to Proto2 (main and slave boards) for well over what it was worth to someone else just because I liked the engine and its history. Sentiment is priceless.