Ive used 4efte injectors in a heap of 4ages over the years and they seem to work pretty good and are plentiful/cheap.
Ive probably got a couple of sets with plugs if you needed some.
I can't recommend a free software but I use Rhino everyday all day which is fantastic for simple 2d right through to large 3d textured models etc.
We also use Rhinocam for CNC programming.
I might be able to help - let me know some sizes you need and colour required.
One of the businesses brings in ACM, acrylic and ali etc so will try wrangle you a deal if you would like?