[Elecraft] KX3 Options Mutually Incompatible?

[Kevin Kleinfelter]

In some of the YouTube videos, I've seen people point inside the case and
state, "This area is for options such as the internal antenna matcher."
 Are (any of) the options mutually exclusive?  e.g. If I get the antenna
matcher and it fills the option area, will I be unable to also install the
internal charger?

To me, the kxbc3 internal charger seems like a must-have, and I'd hate to
have to give up the kxat3 antenna matcher to get it.

TIA