Very well done ships Wiley, I'm especially fond of your Connie, she's absolutely beautiful, and flies great. But most of all, what with the modelled botanical garden and pretty much everything else about it adds up to a spectacular visual treat. I have yet to test her against the Reliant, but you can bet I will.
Also, your Doomsday Machine is brutal against ships of the TOS-TMP era, even the Atriau. I took the Atriau against it, and one well placed blast from the DM blew her shields away then hit her reactor. The crew probably didn't know what hit them.