Virtual Sailor PDRacerBy toliver66 #792 "The Royal Dutches" (5ar)
3d Cad allows you to design all the structure in every detail so you can see what works and what doesn't, what fits, and what doesn't. I Call it "cyber building".
And after you have completed the 3D model its a simple matter to create measured drawings from it to build from. I even exported a 3D model of The Royal Duchess to use in Virtual Sailor so I could take her cyber sailing.
Which after having sailed the real mccoy is surprisingly accurate.