Looks solid, gunnels a bit close to the water but otherwise designed for serious crabbing or fishing. What is her draft?
Keep in mind you should be able to show `Green over White' for "Fishing at Night".
Check out this site for USCG Lights and Signals Rules <
http://tinyurl.com/yfdp55> HBH
As to mast:
. First choice marine salvage yard
. second, schedule 80 PVC
When mounting it is wise to use a backing plate with through bolting so fasteners are not relying on purchase in the FRP. Remember that a mast can be a mean lever at sea trying to pull itself loose. You might want to consider using the mast as an antenna mount but keep in mind proper separation of navigating antennae from RF, at least 3' of separation, more is better. Also twist the positive and negative wires to minimize inductive field disturbance to compass, etc.
Best Regards, HBH Oh yes, if you plan on taking her offshore at all you'd do well to buy a life raft / survival canister.