Gunship,
Firstly, welcome to the OFPEC comunity!
Where can one find the BWMOD. I did a search and cannot find it. I was thinking that if I looked at it I might be able to help you out. Is their a readme file with the Mod that gives instructions on how to do it? Provide a link to the mod or at least upload the readme instuctions for the MOD (if it exists).
OK, I found it. It is realy quite simple to do. You can do it using a script or the inti field of the Tiger when you place it in the editor.
The easiest way is to put this line in the init field of the tiger chopper:
[this,"PARS3","SNEB70AT"] exec "\BWMOD_Tiger\scr\loadout.sqs"
This will load out the tiger with the PARS3 and the SNEB70AT. Other weapon types are listed in the readme.
If you want to do it from a script then it is the same but you must put the name of the tiger in place of <this>:
[NameOfTiger,"PARS3","SNEB70AT"] exec "\BWMOD_Tiger\scr\loadout.sqs"
The name of the tiger is whatever name you give to the unit when you place it on the map.
I hope this helps you.