Yep there's a VehicleMaker.
It designs Civil Vehicles (Cars, vans trucks etc), Military vehicles (Tanks, Carriers and other vehicles), Watercraft (boats, ships, subs and sailing boats), Flyers (Fighters, bombers, utility craft etc.)
Everything comes in wheeled, tracked, lifter, grav, ACV, flapper, winged, rotor flavors.
You can use it to design craft capable of achieving orbit and functioning out to 10D but for M-Drive Smallcraft you use the ship builder.
You can make your designs as basic or as complicated as you want. Weapons are designed with GunMaker and sensors and fittings come from a combination of ThingMaker and ACS (the ship Maker).
I think for a Merc unit you might find VehicleMaker useful for designing "Families" of vehicles; same hull and options, different weapon fits.