Based the look on his brief stint in his brown X-Factor costume, just after he mutated back to his blue fur form during the 'Inferno' Saga. Used some a spare fodder Wonderman, after using the boots to man for my custom Magneto. Cut off the feet & cut & glued on a tactical Toybiz Beast's feet. Feet are a bit big, but due to the proportions Beast had after mutating again, the feet were a bit big.
Head & body - heavily modified Womderman
Shins & back of the feet - heavily modified, spare fodder Red Guardian
Front parts of the feet - ToyBiz Tactical Beast

Sorry about the pics.