Both exist in canon. You will be able to build the 50tn heavy fighter using book 2 rules as well (perhaps with a little bit of fudging, especially as book 2 does not consider armor). Regardless, the Ships Boat will likely be the best you can get as a civilian.
So the upshot of all this is that a purpose-built military vessel is still better than a tricked-up civilian vessel of approx the same class/capacity? Common sense would have pointed in that direction, but it's nice to see the system enables it.