Outboard crossover? Why not?

Here is a photo of Naim SBL x-over, original (L) and with upgraded parts (R):
http://square-2.com/wp-content/uploads/xover_Naim_Audio42.jpg
now, the same original (R) with more serious upgrade (L):
http://square-2.com/wp-content/uploads/xover_Naim_Audio42_2.jpg
and my final choice, an external x-over for both SBLs:
http://square-2.com/wp-content/uploads/crossover3.jpg
http://square-2.com/wp-content/uploads/crossover3b.jpg
Built for me by Steven Foote of Audio-42
Nothing can beat electronic crossover: NAXO2-4 with Hi-Cap but for now this is what I am listening to. Naxo/HiCap kept in safe storage.