I will answer in SS's place.
The WFA code is something you will not easily trace through.
Mods for Q3a were not created in a nice OOP environment. Functions/procedures are global, taking two or more operands:
example declaration: vec3 dot(vec3 *a, vec3*b)
if you have no inkling of what that above function does, you are not suited to modding a 3d game.
Interactions are rough to trace through to say the very least.
If you want to mod WFA, first go download the q3a SDK from some old website or even the q3a SOURCE CODE which has been released under the GPL. Only, if you can understand and successfully mod baseq3 will you ever stand a chance of being able to use/improve the WFA source.
What are you trying to accomplish?