I already know that PS takes a lot of chakra, that doesn't mean Madara can't hold it up for a long period of time like you claim.
Nope. V2 Susanoo doesn't have Yata Mirror. It took it on by itself, CST will not harm Perfect Susanoo.
You must be registered for see links
Not when this was blocked by V2 Susanoo which is leaps and bounds weaker and smaller (Thus less defenese) than PS.
You must be registered for see links
Shinra Tensei has a 5 second interval and Mokuton can be produced by Hashirama every second. Chakra guns won't destroy all of the large scale faster than Hashirama produces it.
That's under the assumption CT would be powered up by Susanoo, when it doesn't even work like BT and ST so making that comparison is pointless.