[Elecraft] KFK1-2 Question

[Curt]

I originally built my K1 using the KFL-4 for 40,30,20&15, and shortly 
incorporated the KAT1.  I have a KFL-2 kit am wanting to build for 80&17, 
but note that a C78 and RFC8 is to be incorporated onto the RF board.   This 
has given me pause because the K1 works flawlessly, hate to screw it up to 
allow using two other bands.

I'd appreciate hearing from anyone who has walked the path I am 
contemplating with advice about utility of it,  especially, switching out 
filter boards from time to time.  What are the ramifications of not 
incorporating the RF board changes?  If I incorporate these changes for 80, 
will that foul up performance if later reinstall the KFL-4?

Regards, Curt, KB5JO