although L-R 4th order crossover is excellent on paper, it may or may not be the best option because u will need LOTS consonants.
for woofer, inductor are more important. get as thick as you can afford. u can use bi-poler cap.
for mid-range, capacity in series are important, get some good one. Audyn, or Audyn Plus. for inductor, copper foil is better, u don't need thick one, 14GA or even 16GA are pretty good already.
for tweeter: cap is extremely important. maybe use Audyn Plus only. again, copper foil inductor 14 or 16GA.
with fewer consonants, u can afford better quality ones.
resistor for are very important. don't use cheap one. use only non-inductive resistor only no matter where is it at. compare to other consonants, resistors are cheap. a very good quality (mills) cost only $2 a piece. there is no reason to use cheap one.