I have a decent (not great but decent) home theater in my basement. I will be building a new cabinet and t.v mount and want to attach the main speakers to the "backdrop" beside the t.v.

Currently I have a decent set of main speakers, they are floor standing and have two 5.5" drivers, a 1 " tweeter in between them, and an 8" sub at the bottom. But I don't like the enclosures, and don't like the fact that they are floor standing.
I was thinking of getting rid of these speaker enclosures, and building my own smaller ones with 1/2" MDF, veneered with real wood and finished nice. I would use the electronic components (speakers, cross-overs) from the existing speakers (cause there's nothin wrong with them) except GET RID of the 8" subwoofer and it's required cross over.

The new encloseres would be much smaller (only housing the 5.5" and tweeter) and I could then mount it as I want it.

Can I do this or am I messing with something that shouldn't be messed with?