If you happened to run through Lure of the Expanse, or if your GM just happened to know of it, Zayth, and said "I don't need all that, but I have a reason they might go there", if you were to make a deal with the people there regarding trade in their macrocannons, are they any different than the one's in the book?
I know they blessedly load themselves, but I don't know if they are any better. Does the loading mechanism take up more room than the regular cannons? Would there be an advantage to having the crew free to do something else? I guess what I'm getting at is, has anyone written up a fan entry for Zayth Macrocannons, entailing their cost, rarity, special rules, advantages and disadvantages? In LotE, they seem like one of the cooler perks you might get, that actually seem like you could get them, as opposed to the happy "rebuild the Light of Terra" option we all like to talk about, but could be a logistical nightmare, and a 20 year investment.