Siege mage-wizard or siege bomber alchemist?

[Gun Dragon]

My GM said no to my unicorn warpriest and magus halfdragon and any races with an ecl but he said that I can take the craft construct feat and make a light animated ballista. And I am level 8. What will be the craft DC of the light animated ballista? I know that I don't have the level 5 permanency spell. And what class will be better? I know the wizard gets some siege weapon spells and spells for constructs. And the alchemist gets a discovery to put his bombs on the ammo?

Do anyone have any advice and tips for me?

I want the ballista to follow me around and its arms to fold in to fit through doorways I may want to have it made so that I can aim and fire it myself.

[Purple Dragon Knight]

siege mage archetype is for sea adventures where you're on a ship full of siege weapons; either that or for some boring tower defense or siege defense kind of scenario / game...

why would you possibly go to such troubles to make a light ballista follow you around?? 3d8 damage once a round at most?

[Gun Dragon]

I don't want to hire 5 npc's just to take it apart and take it places.

[Cap. Darling]

Sige mage is a terrible class even spellslinger is better. At no level past 4 is it worth a wizards standart action to fire a ligth ballista.

[StDrake]

You can count a scroll of permanency plus the usual cost of casting permanency with animate object - as part of your wealth for that level. Somewhat more costly, but it gets the job done. Maybe hiring another spellcaster npc to do it for you could turn out cheaper.