Jool currently isn't in the 1.5.1beta branch. Put it in there.
I likely can't use stock Jool as a template since it doesn't have a surface. I can use Greg's Jool implementation though, and add Snark's Jool Biomes and OhioBob's Realistic Atmospheres 1.3.0 changes to it.
Check the surface pressure at the launch pad on the existing Jool home world and make sure the revised Jool has a similar surface pressure at the launch pad. Raise or lower KSC as required.
Jool currently isn't in the 1.5.1beta branch. Put it in there.
I likely can't use stock Jool as a template since it doesn't have a surface. I can use Greg's Jool implementation though, and add Snark's Jool Biomes and OhioBob's Realistic Atmospheres 1.3.0 changes to it.
Check the surface pressure at the launch pad on the existing Jool home world and make sure the revised Jool has a similar surface pressure at the launch pad. Raise or lower KSC as required.