I see no disadvantage.  

I have built three, each of which has all of options you are considering.  As 
David says there are some parts that need to be unsoldered, and a couple where 
the through-holes need to be cleaned up for inserting something else.  
Nonetheless, when I built mine even though I ordered the options at the same 
time as the base kit, I finished the base kit completely first, then went back 
in to add the options.  Two reasons -- first, if there were to be a problem 
somewhere I wanted to be able to analyze it in the least complicated way.  So, 
K2 first, test, then each option and its test.  Second -- it's a kit.  That's 
part of the fun.

Ted, KN1CBR
    ------------------------------
    
    Message: 18
    Date: Fri, 25 May 2018 22:06:45 +0100
    From: David Woolley <[email protected]>
    To: AE0MM <[email protected]>, Elecraft Reflector
        <[email protected]>
    Subject: Re: [Elecraft] K2 Build: Options Advice
    Message-ID: <[email protected]>
    Content-Type: text/plain; charset=utf-8; format=flowed
    
    The disadvantage is that you will need to unsolder some components.  In 
    most cases, I think you can destroy the through holes, but there is at 
    least one case where you have to insert a new value in the old hole.
    
    There used to be a, third party, product, called UnPCBs, which provide a 
    minimal dummy version of most of the modules, but the sales of the K2 
    dropped to a level where it wasn't worth another production run for the 
    PCBs for this.
    
    -- 
    David Woolley
    Owner K2 06123
    
    
    On 24/05/18 19:44, AE0MM wrote:
    > I'm planning to build a K2/10 with the following options:
    > KNB2
    > KAT2
    > KAF2
    > 
    > Is there any disadvantage to building the base K2, then adding the 
options later?
    
    
    ------------------------------
    
    

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