You can change up to 6 of your Experimental's body parts, you can choose three different choices for each, Metal, plant or animal.

Metal: Gives +1 bonus AC or CON, (this cannot make AC or CON scores exceed 20)

Plant: Gives Better WIS and one proficiency

Animal: Gives a specific attack with that limb, does 1d4 damage per level, this stops at level 15.

The Possible limbs you can choose are:

Leg: gives +10 feet of speed.

Arm: +1 modifier to strength and dexterity.

Eye: Gives 10 feet of any sense other than truesight

Nose: Gives +3 passive perception

Tongue: Gives Proficiency in Intimidation

Back: Gives 20 ft of fly speed.

Hand: Gives +2 DEX

Teeth, Gives +2 modifier to animal attacks with teeth

Tail: Gives the prehensile tail feat.

You can only use one body part once