I will agree to all of that.
Updating Pilot Juggernaut Spell Working Draft.
Updating Activating A Guardian Juggernaut Working Draft.
Are we keeping the Material Component requirement?
How much should the mask focus cost?
I've added a Juggernaut Domain placeholder to the Activation Working Draft.
Did we want to add other construct types to the table or just a note that require CL is up to DM judgement?
I'm more inclined to have the note say additional construct types are at the DM's discretion but give a rule-of-thumb for suggested CL. The posted examples suggest a rule of "double Challenge Rating and then subtract three" which would indicate a standard Clay Golem (CR 10) would require a CL 17th to pilot which seems in about the right ballpark.
That would mean a Shield Guardian (CR 8) needs CL 13, which seems a tad low - especially as the construction requirement is CL 15th.
At the DM's discretion, pilot juggernaut can be used to pilot other constructs. The caster level required to pilot a construct is normally either the construct's construction CL or the result of doubling the construct's Challenge Rating and subtracting three, whichever is higher. For example, a clay golem (CL 11th, CR 10) requires a caster level 17th pilot juggernaut (twice its CR 10 minus 3) while a shield guardian (CL 15th, CR 8) requires a caster level 15th pilot juggernaut (its CL). If the construct has some unusual traits that make it more or less effective as a piloted juggernaut the DM may want to increase or lower the required CL to compensate for its change in effectiveness.