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In JTAS #1 or #2 is found the 'AnnicNova' a unique idiosyncratic starship that can unfurl solar collectors in order to charge it's jumpdrive.

So, no L-Hyd is actually required to initiate, leave, or travel thru j-space.

Also, as far as Xboat life support goes (no PP) I can imagine lots of ways to provide the power to keep life support going long enough for travel thru j-space, exit, & recovery as I'm sure we all can.

Remember that  in the supp that detailed the ships of the S'Marches there was detailed the 50dT heavy fighter which was carried by the Tigress & other BB's. It is mentioned that the fighter is capable of independent operation for an extended period of time. Several weeks I believe. Now it does have a PP but this illustrates that very small craft can & are designed to operate for lengthy periods on their own.

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