When you take a construction material for the Half-Golem, you have to take that same material for the respective golemaic weapon.
I'm still one feat short since Rashemi Elemental Summoning doesn't work with Travelling Companion and I don't feel like screwing with my spells known sufficiently to make summoning via spells a thing that I can do.
So how about the Miser with Magic feat from Kingdoms of Kalamar?
Miser with Magic [Metamagic]
Your character draws upon the minimum amount of arcane energy needed to cast a spell.
Prerequisite: Spellcaster level 7+.
Benefit: You can make a Spellcraft roll to retain the use of a spell after you cast it. The Spellcraft DC is 10 + twice the spell’s level. If you succeed, you managed to conserve enough magical energy, from this and other spells you have cast, that the spell (or spell slots for sorcerers) is not considered spent and may be used again. You may only use this ability on a number of spell levels equal to the ability score modifier appropriate to the type of spells you cast (Charisma for sorcerers or bard spells, for example).
Special: If you fail the roll by 5 or more, you spent insufficient energy to cast the spell at all. You lose the spell slot, and the spell has no effect.
Infinite spells as long as you keep doing easy spellcraft checks? Definetely not.
Is 2,200 gp enough for a better-furnished cockpit? Or, at least, some sort of spare seating for people, given how much she can stash in there somehow?
Sure you can buy one or a dozen more seats. Doesn't change everything will be crunched up and piled up on top of you when the cocpkit is closed. So if your plan was to try to make it more confortable, I would recommend don't stashing any non-vital stuff.
Which reminds me: do Deceivingly Innocent Form and Monster Lord leave you with larger carrying capacity or not? I can't work out if those're actually size modifiers.
Yes for monster lord, not for DIF.