We've designed, fitted and modified more keels over the years than I care to remember.     More recently, with the Quarter & Half-Ton resurgence, we've been fitting the standard Mills keels from Irons Brothers, including adding extensions as and when required.   I've also supplied just the designwork for others doing their own boatbuilding work.   We fair to very high precision templates using only low shrinkage epoxy products and finish in polished Durepox which is incredibly hard wearing and looks like gelcoat.