[Jack Simth]

Oh, that's not so hard:

Kaylin's Great Warping
Transmutation
Level: Sor/Wiz 7
Components: V, S, F, M, XP
Casting Time: 48 hours (counts as continuous walking, use Forced March rules for walking the entire time; the target can sleep, eat, et cetera as normal, but the caster must cast continuously)
Range: Close (25 ft + 5 ft per 2 caster levels)
Target: Willing subjecy
Saving Throw: Will negates (Harmless)
Spell Resistance: Yes (Harmless)
Duration: Permanent

This spell functions like polymorph, except that it enables the target to assume the form of any single nonunique creature (of any type) from Fine to Colossal size. The assumed form cannot have more Hit Dice than your caster level or the targets Hit Dice (whichever is lower, to a maximum of 15 HD). Unlike polymorph, this spell allows incorporeal or gaseous forms to be assumed.

The target gains all extraordinary and supernatural abilities (both attacks and qualities) of the assumed form, but loses the target's own supernatural abilities. The target also gains the type of the new form in place of the target's original. The new form does not disorient the target. Parts of the target's body or pieces of equipment that are separated from the target do not revert to their original forms.

The target can become just about anything the caster is familiar with. The change takes place as the culimnation of the 48-hour ritual. If you use this spell to create a disguise, you get a +10 bonus on your Disguise check.

Focus: A single diamond worth no less than 100,000 gp.
Material Component: Diamond dust worth at least 10,000 gp.
XP: 2000 xp, which can be taken from the target, the caster, or any combination thereof, at the caster's sole discresion.

Edit: Now you just need to spend the GP, time, and spellcraft checks to actually research the thing.... 1,000 gp per week, 1 week per level of the spell, spellcraft check DC 10+spell level; so 7,000 gp, 7 weeks, and a spellcraft check DC 17.... crafting portal applies.....