I recently made a TL-9, 100 dTon, J-1, Type A, Needle configuration Trader, 1-2 crew, with the T20 Rules, for use within the Khuur League and surrounding cluster, in the GtD campaign. it was designed to barely make a profit after monthly payments and other operational costs.
this ship doesn't have fuel scoops for refueling at gas giants, but does have a fuel purification plant, because many of the worlds they will be visiting have Class C & D Star Ports.
I don't know about other Traveller game rules, but T20 says any ship using unrefined fuel rolls against a DC of 21 with a +2 modifier on a D20. that is a 10% chance to miss-jump, every time unrefined fuel is used. and this is a separate roll from the astrogation check.
as far as the OP, it would depend on if the ship you built fits into the campaign any players are playing in. otherwise, the players will just have their characters use it until they can get a better ship.