Stupid DS2 Question

I can't find it, and that just means I'm missing it 
as I'm sure I've seen it before.... but how big 
(cap points) is a DFO load? 

And has anyone done rules for things like 
sidewinders (A2A missiles for VTOLs)? Or can 
you just use a normal GMS? 

And when you do lander design, do you usually:
1) design the lander, pay the points for it, and let 
it fight if it has any weapons
2) pay the "interface landing" penalty for any 
troop units it carries (and I'd assume vehicles if 
it was a big enough lander?) and not worry 
about paying for it? If so, would you let it fight?
3) If the same lander was then also to be used 
for casevac, would you pay another 100 pts for 
it?

This whole area of how to cost VTOLS that can 
be troopships and reach interface orbit but have 
some light support armament and can make 
some bomb runs and can also serve as casevac 
leaves me a little lost. This seems reasonable 
from a "reality" (or pseudo reality) point of view, 
but I'm not sure how to cost it. 

Tomb.