It should work fine, you can put the double nav, and everything you else you want on the CMPS as well. All the custom features should go on as well, It really dosen't change much, Its a nice easy to work with, I have over 30 plugins and tons of custom modifications, and my site still works fine (maybe a little slower then normal but

) Or if it dosen't work out with you in some way , just uninstall it. No big hassle