[CA] [CA11] Upgrading to Axioms, integration and Auto Pilot help?

[SE-FL]

Q4 The B260 is actually not mounted in a fairing block. The Keel has a flat surface part just forward of the center console and forward of the 2 steps (it's a double stepped deep-vee hull from 1988), where the keel fiberglass hull was actually cut to the shape of the face/head of the transducer and the face sits flush in line with the bottom of the keel so it does not protrude below it at all and is all continuously smooth. That is why if I do replace it not too keen on having to do any more cutting/glassing and would like to have the same shaped face put in there if not using the exact same B260.

Q5
I am looking to use the RV-200 (currently do not have an RV installed, just the B260). I was going to install it just aft of the B260 which is on the keel flat surface part, about midship center of the hull or slightly aft of center.

On a slightly different note; I am thinking of the options and maybe to go with the Axiom Pro RVX 9" and then an Axiom 12" chart-plotter/display only; Will that setup allow all of the features being used on the pro to be viewable/usable on the 12" display only kind of using it as a repeater display?
If that is the case I could then have the RV-200 transducer for the 3D/DV/SV/RV, and another 1kw thru hull for the deep sea ability like the B260, both plugged right into the back of the Axiom Pro and then can avoid having to go through the CP370? And would those then be view-able on the 'repeater screen' of the standard axiom 12" chartplotter display?

Basically I'm looking at wanting to have a 12" and a 9" display, the benefits of the realvision 3d etc for shallower waters and the 1kw deeper ability as well, and want to have the autopilot (either adopting my old system into the new or replacing with just the acu-150/ev-1/p70r) and connecting the 4kw hd color radome to it along with a vhf that receives AIS to display on the mfd's radar/chart and display/control my fusion radio on the mfd.s All while trying to do in the most economical way haha, I know asking a lot. So I originally was going with the deal on the 'boat in a box' Axiom 12 & 9 inch RV units but after having to add the remote key pad rmk-10, and possibly also the remote chart card reader with the addition of the cp370 for 1kw ability I'm now considering as I wrote about with the 1 Pro unit. My couple local retail stores weren't able to answer much at all so any input and guidance help would be much appreciated from all. Thank you.