RE: Airsoft battleships?
There are no Ready to Battle other than used ships (which may or may not be ready). Yet. It is pretty much a scratch-build hobby. You can get plans. You can get hulls. You can get some superstructure parts. Again, check RCNAVALCOMBAT.com for your closest club in the format of your choice. You can get a lot more information at a local battle, or even going to a NATS (Small Gun) or NABGO (Big Gun). Also, many clubs have club ships for loaners (ready to run and free, if you will maintain and battle them while deciding on and building your own ship). It may be a dowdy old freighter, but it gets you in the fray. Many clubs also offer build sessions to help you get going on your ship. Andm they can let you know about used ships for sale.