Starting from the given dimensions in S&A....
If you scale up the width and length but not the height, it *might* hit the top end of the acceptable range for a 100 dton hull, since it is an airframe and not a simple ovoid cylinder, but you get a hull cross section that is more than twice as wide as it is high, and any lower deck flattening you do to regain more of the floor space just drives the volume back up. The simple ovoid is 170 dtons, and you'll be pressed to shave 50 dtons off of that even with the narrowing hull aft.
Scaling up the entire hull by 1.5 gives a roughly 200 dton result after airframe shaving.
Using the original dimensions gives a simple ovoid of only 75 dtons or so; airframe shaving will take more off of that, leaving the original as written a shade larger than a Cutter...