I have done the stats for a CODA style Nova myself, but mine is different in a few ways because I use a designation of "Heavy Surveyor" for the Nova. This allows the purchase of more powerful phasers for the vehicle to reflect her Type X Phasers.
I know that the "Heavy Surveyor" designation sounds a bit silly, but the vessel is a surveyor that at the same time is slower moving than most vessels (at least most we have seen on-screen) and has Type X style Phasers (according to the Starship Spotter). This would seem to correspond to the 'Heavy' designation from the Narrator's Guide. I also allow the ship to buy its Sensors at the 'scout-rate' because it is such an integral part of the vessel's role (btw, would a cloak be possible for the ship, I would not allow a surveyor to get the 'scout-rate' to buy one because there it makes little sense for a Planetary Surveyor to have one).
"If you haven't got anything nice to say about anybody, come sit next to me."
- Alice Roosevelt Longworth