dont worry too much if you want to build your own speaker cabinets.
the lines dont need to be perfectly straight or smooth.
you can nail the boards together (or use screws if they are small enough .. otherwise a pre-drilled hole does help)
get it held together and then use something as simple as a hot glue gun to seal up all the gaps from the inside.
you could get a cheap jigsaw off ebay if you cant find one locally ($20 - $30)
then drive down the alley to see where they keep the garbage and hunt for some wood.
if simply cleaning it doesnt do it for it, you could leave it out in the sun for a while .. or simply seal the wood with paint.
$30 for the amp
that leaves $140 for midrange .. tweeter .. crossover .. speaker wire
the question is,
is there any reward for building it more in-depth?
the one thing i havent heard about the DIY speakers at parts-express .. complaints
(i havent heard much, but from what was there i say)
A buddy of mine built a speaker box out of a cardboard box, pencils to keep it from exploding out the back, and duct tape.
Sounds pretty decent for less than $1 worth of materials.