Training NPC crew members

[Canton Ohio Pathfinder Lodge]

In my campaign the PC's have just re christened the vessel from Rickety's. The captain wants to begin setting up crew in battle stations so when they enter combat NPC's already know their assigned roles. None of the pirate templates have Knowledge(siege engines) or proficiency with the Light Balista's. They want their Master Gunner to train the crew in groups to use the Balistas. I have developed a mechanic for them to do so and would like some feed back. My thought was that the PC training them would be able to train 1 NPC for each rank in Siege Engineer they have or to use their INT Bonus.

Training NPC’s in Skills

To train a NPC in a specific skill such as Knowledge(Siege Engine) a NPC must have a minimum
of 3 days training. The NPC gains only a specific knowledge or skill that applies to one particular use.
ie. Knowledge( Light, Ballista) would not apply to Knowledge( Catapult). At the completion of the training the NPC gets to make a INT check with a DC 15. The NPC gets a +1 bonus to the roll for each day of consecutive training/ drilling in the skill. The number of days of training must be established before the training begins.

Example.
Jimmy Twothumbs is going to be trained in Knowledge( Balista, Light). He is going to be trained for 3 days. At the end of the 3 days Jimmy Twothumbs would get to make an INT check DC 15. He would get +3 for completing 3 days of training/drills. Jimmy has an INT of 10 so has a base of 0. Jimmy rolls a 12 which would be a total score of 15 allowing Jimmy to gain the desired skill. If the check was failed Jimmy would have to be trained again. There is no bonus for the already trained days since Jimmy failed the roll.

[ferrinwulf]

Sounds good to me, I did pretty much the same. The player with the master gunner PC wanted to train his gun crew by shooting at target out on the water and firing the catapults using cabbages. Sounded like a good idea so I just ruled it he would be able to train up to 10 crew in 1 week with pretty much the same end result as you.

[Herbatnik]

There is no Knowledge( Ballista, light), NPC must take a exotic weapon profinency (light ballista) to use this without penalty. My players have option to search a specific-skill sailors with social dc25-30( depends on target) check. Success allow to recruit 1d3+1 specific npc.
Just my 2cents

[Thanis Kartaleon]

UCpg has rules on retraining which might be applied to the initial training as well.

Ability Score increases take 5 days
Class/Archetype features take 5 days
Class levels switched to unaffiliated classes take 7 days
Class levels switched to affiliated classes take 5 days
NPC Class levels switched to PC class levels take 3 days
Feats take 5 days
Hit Points take 3 days
Languages take 20 days (not the same as retraining Linguistics)
Racial Traits take 20 days
Skill Ranks take 5 days
Spells Known take 2 days per spell level