I wouldn't mind a more cargo oriented carrier - as in having only 4 large pads/hangars instead of 8, but having more capacity
But i guess i can wait till they introduce the Panther Clipper
I cannot get over the notion that we could have had modular Fleet Carriers.... that depending on what we install changes how they look... In what order we install modules would change the look... and the only parts that are "fixed" and the front and back, where our modules goes. so as you add modules the longer the ship gets, until a you reach the max size, ie length.
This also opens up for having various Fleet Carrier designs.
Small - a single row of modules in a line (1x1), so these would be smaller than what we currently have. Expands one module at a time
Medium - two parallel rows (2x1). more like how the current fleet carriers look, Expands 2 modules at a time
Large - 3 parallel rows (3x1), arranged like a triangle, Expands 3 modules at a time
Huge - 2 parallel rows stacked back to back (2x2), think two current fleet carrier where one is flipped upside down then docked together. Expands 4 modules at a time.
So if it is a personal FC you could add 1 small, 1 medium and 1 large landing pad, and use leftover space for something else, like storage modules.
And as we add more modules, Fleet Carriers could have different sized FSD, Thrusters etc, so before you reach the max, you need to upgrade FSD, Thrusters, etc, so you can keep adding modules until you reach the biggest size you current variant supports. And of course maxing out a Huge Fleet Carrier would be ALOT more expensive than maxing out a small...
And as we discover more Guardian stuff, and perhaps Thargoid tech, we could get new modules that would allow us to make our Fleet Carriers even longer... Just like we have Guardia weapons, powerplant, FSD booster etc.
And this would actually work as the OP wants, he could now build the Fleet Carrier he envisions with the needed internal modules and enough storage space. Just pick a suitable starter kit for a Fleet Carrier (small, medium, large and huge) and then outfit it for the desired task you want to use the Fleet Carrier for and if you want a big one, it will most likely cost you an arm and a leg...