Terribly sorry to hear about your troubles FM.
My best advice is to see if any guntubers, gunbloggers, or other folks of influence in the broad and general realm would do a vid of your gatling gun. Get that PR and then sell it. GarandThumb is up your way IIRC, maybe worth trying. This is a one-of-kind item so unique and compelling content. Maybe you could do a guest appearance...
Left field, but Terrance Popp, former SF/Green Beret, does some gun/preparedness stuff in addition to his main MGTOW bent (resulting from losing custody of his girls while on constant deployment in the GWOT), and he might be worth reaching out to if no one else responds. I think he's on his emails to help dudes in crisis.
I personally cannot afford your setup in the multiple $Ks range right now. If I could, I'd buy it...
But are you currently still offering all of your stickies services? Please specify what's no longer offered. If so, I'd gladly send some business your way once I review what's what.
Alternatively and less $, you can look into Armslist, Falfiles and AKfiles classifieds, Afcom classifieds, classifieds here, gunbroker, etc.
And I'd highly encourage you to get your setup into whatever compliance you think you need to sell -- may only require engraving your name and a serial number... I'm far from an expert on home builds, but they can be sold once marked.