Using various tutorials, ive now got this packaged as a single new .pack file that can be drag and dropped in the game directory. New unit count is currently 3. When I do a few more, I'll release it. Also as im not really after any sort of kudos, I'll happily give my data files over to someone who's making their own, bigger, new unit mod and they can go in it. Im only making units for my own enjoyment anyway.
So unit #1
British - Royal Marines (Max 3 Globally Recruitable)
Similar stats to line infantry. Using the ship marine model and textures to put the marines from the ships into the game as a unit. Will be tweaking that over the next few days, as well as creating their own info page and icon. Will also try and do US and Generic versions.
Unit #2 (I posted somewhere else)
British - Irish Guards (Max 1 Recruitable in UK)
Basically I used the stats from the coldstream guard unit and the texture and model from the irish regiment. This was my first tester unit which I'll develop as I can
Unit #3
British - Hessian Jaeger Infantry (Max 4 Recruitable in the americas)
A light infantry unit to partner the Hessian Line Infantry (Also plan on doing a grenadier version). Using the prussian Jaegar textures and models with some stat changes suitable for mercanarys.
Currently the .pack file is deployable but Ive found ive had to edit the localisation.loc file in the games main patch.pack file in order to give the new units display names. Does anyone know if there is a way around this? because obviously the new unit display names would get over-written via the next patch. So my only way to distribute this is with a pack file, some instructions on editing the C:\Users\%username%\AppData\Roaming\The Creative Assembly\Empire\scripts\user.empire_script file and a tsv of the localisation text file which can be imported into the patch.pack via the pack editor.
So when ive done a few more units and sorted out the distribution question above, I'll give this out.
EDIT: Just Added Sharpe's Rifles (A smaller new unit based on the green jackets. Better shots, harder, faster, fewer in number. Only 1 recruitable)