I tend to centralize research too, although I might try building additional labs in my last base next time instead of more workshops.
My usual: Main base has 4 labs, 3 living quarters, houses 40 scientists, 16 soldiers (main team and replacements for injured ones) and 3 pilots (dropship and two interceptors), second is manufacturing base right next to it with 5 workshops, 3 quarters, 50 engineers and team of soldiers for defense, along with some base defenses. This provides AAA for main base and does all the disassembly. One dropship and one interceptor hangar are there just for manufacturing purposes. Second and third base are identical, 2x living quarters, 2x workshop for keeping ammo supply up (I spam EP ammo at late game), 2x interceptor, 1x dropship and usual complement of troops and pilots. There's enough space left for AAA. Workshop is the only base without radar. Using this and three radar sites, I can get good coverage of most populated landmass.