I would suggesting buying the Anatomy of ship book on the Fairmile D
There were that many variations to them see which version you like and then work out what would suite you best
the Deans is a kit and comes with all the bits for theirs but it is no great deal to get wood and plasticard from a model shop
once you had the hull from kingston.
cost may be another thing the kit is one large lump sum but for the semi-kit you could buy it over time when you had the money
my feeling is that the kingston hull would suit you best and looking at your back ground you may want to try and build
alot of the fittings and the book has some great drawings on the weapons and fittings that would help you

as well as various scale drawings
of the differrant versions
hope this helps
Colin