What size are the parts you are looking to trim, what is this trim path on the diagrams you have got. To trim the trimpath, will it require all three axis to move simultaneously, or can you fasten the part down on your table is such a way that only two axis need to move to follow the path (yes - the third will have to come down and up at the end - with the tool - but does not take part in the trimming)
To give you an idea - a CNC machine is programmed on a graph of X and Y with commands which move the cutter from where it is now, to where you want it. e.g. starting at point 0,0 - G0 X1Y0, G0 X1Y1, G0 X0Y1, G0 X0Y0 - will move the cutter in a square of 1 unit dimension. If you then want to add the Z axis up and down, you can add the z position to any line as well (in fact Mach3 will deal with 6 axis). As written, the axis move simultaneously - if you want one to move, it is the command followed by the axis to move.
If your drawings show positional information, then you can write programs from it. BUT to make it worth while, you really need to be repeating it a few more times - repeatability is one of the advantages of CNC - say a minimum of 6 depending on how quickly you can write the program. Also CNC does not do curves (apart from circles) so any curve has to be built up from little straight lines.
If these parts are all different - you may find that some form of probe tool and a mapping program would be an advantage so you could map the trim edge and run a program from that.
You will also have to take into account the diameter of your tooling - so you have plenty to go at.