I just went through a very similar scenario. A few months ago I bought a base K3 with one extra filter, the KAT2 and KXV3A. I purchased the kit version. A couple of weeks ago I decided to add two 200 matching filters, the gen coverage rcv, the sub rcv and the 100 watt kit.
This is a fairily major upgrade since the sub requires removal and some disassembly of the front pannel to install the sub's DSP.
I first studied the original assembly manual to see the order of adding these at the time of original build. I then proceeded with the manuals for each of the three new modules, sub DSP front panel firsr, then gen cov, then 100watt, and finally the actual sub rcv.
Although it seemed a little overwhelming at first, when looking at all the parts and instructions, the process was very straightforward, almost too easy. The instructions are excellent as expected. The best part was that everything worked.
The only difficult part was getting the sub installed, in particular, getting those darn cables positioned correctly and out of the way. This has nothing to do with adding it later. It's why you don't want to remove the sub too often. Hint, get any other modules you want first, including filters.
One last point...by building the K3 kit to start with, you won't be intimidated to do some add-ons later.
Good luck with your purchase.
73,
Don KA1KU
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