A common install on my side of the country is as follows:
4x4" PVC, with 4x600KCMil Cu., from pad mount to gear, bottom entry.
CT Section and distribution in adjacent sections.
(NO Main OCP)
Sq D 3R equipment is nice; other brands are choices based on $$$, availability, and personal preferences.
However, a check with your local AHJ, and local POCO should be your first step, as local rules may apply.
On a personal note, the possibility/probability of the 'future' of the site should also be considered. I have seen quite a few of 'MLO' installs having to be replaced with 'MOCP' due to space/tenant changes.
Feeder breaker buss should allow the replacement of a 200 amp original CB with a larger frame IF needed down the road.
Comments are just thoughts from my experiences.
