OK - so I worked out how to install .umod files in Linux thanks to https://gist.github.com/soifou/e863b978d1f01e33691b
I've got the mod installed and updated my ./ucc.init script to always boot with the AllWeapons mod enabled - and in game it appears to have 'half' worked - i.e. it's clearly had an effect but it's not quite right.
The weapons weren't fully loaded and the ASMD was missing.
I've done a fair amount of Googling but couldn't find anything - I assume there's some INI file tweaking that can be done to tweak settings relating to a mod and I suspect the AllWeapons mod needs some changes to allow all weapons and start with maximum ammo (i.e. 50 bullets for sniper rifle)
Any idea as to where I can find some documentation for the AllWeapons INI settings?