Hey, Bill & Ian!  Wow! This is great! I'm on my way. Here's my first pass at a budget, using online retailers. Figure add 20% for other items. Shipping, too. So, maybe $7,000?
Ian, how far off am I?

Parts needed & Notes
Three Units	1370	3	4,110
Pump			300
Bronze fittings			50
Hose			100
Fiberglass work			100
Ducting			100
New Through-hull?			300
Misc			100
			5,160
Need to build mounting plates
Need to run thermostat wires and mount thermostats
Need to check for through-hull for cooling water egress

Still, looks like a BIG project. 

Kind Regards,

Steve Bode
Capt. SV Intention
Amel SM #117 (1994)
+1 415 710-6659 Mobile/Text/WhatsApp
facebook.com/stevebodesanfrancisco
svintention.com