[FT] Tug/Tender Rule Question

Hello,

I have been playing around with the idea of a cruiser sized ship with 
Tug/Tender ability to carry 4 Mass 10 subcraft (non-FTL fast Gunships).

Inspired by the old Traveller Battleriders, Battletech Assault
Dropships, and 
the Evil Empire Tau which appears to use the same idea.

My question has to with when these subcraft jump from system to system. 
 Are 
they attached to the tender by "jump collars - ala Battletech" or just
within 
the expand field?   

Following   up this if "on Jump Collars" which can allow access from
Gunship 
to Cruiser should there Mass cost for this, or is it covered in the
added 
Tug/Tender mass?   And if the the ship enters combat with Gunships
attached, how 
fast can U deattach?

Thanks for the help and comments

Have a Good One,
DOC Agren
     (Lurker on the Digest)