It would be for looks unless you used appropriate feet to isolate the platforms. Adding the wood may also introduce a subtle tonal change to the system. You could try adding isolation feet to the amps without the platforms.
Isolation platforms
Over the summer I purchased a Timbernation 3 shelf 2 in. Tiger maple audio rack along with 3 in. isolation platforms for my ARC Ref 750s. mono amps. My question is do I also need isolation platforms for my ARC Ref 6SE and ARC Ref 9cd ? I was thinking of also getting 3 in.
maple platforms for each of them. Would it be more for looks or would it really be useful for isolation.