The Effigy Creature template in Complete Arcane makes a construct version of an existing creature, and retains any feats that creature had which improve its attacks, such as Multiattack, Weapon Focus, Improved Critical, Improved Natural Attack, etc. Note that you cannot design an Effigy of a creature with class levels, only a basic base creature with whatever is printed for a typical member of that race. However, you can use a templated creature as the base creature, certain templates can be applied multiple times (Half-Dragon, once for each variety), and the Effigy creature doesn't cost anything extra to create as long as the templates don't increase its size or number of hit dice. Last I checked, there were forty-two possible half-dragon varieties, which will give it +336 Strength and +126 natural armor.