Anyone have a fully upgraded KAB 1200?

Not fully.

 I purchased the rca cables to swap for the stock ones. No one can do this work, remove old ones, solder on new better quality ones,

 I won’t attempt it, consider me Tim Taylor (toolman)
   I would destroy something.

 Taking off the plastic base, and getting it all back together like new, wish I knew someone who could do this. Someone who has experience.

I purchased the rca cables to swap for the stock ones. No one can do this work, remove old ones, solder on new better quality ones, I won’t attempt it, consider me Tim Taylor (toolman) I would destroy something.

There is a step by step tutorial on youtube how to disassemble Technics turntables for rewire.  

The KAB PSU mods are an easy recommendation as are the Isonoe Sorbothane Boots from KAB. I’ve used the older switched mode PS units sporting the green light box to wonderful results.

For the platter bearing, EAR Isodamp SD-125PSA (same stuff used by SME) works well applied to the underside of the bearing thrust plate along with a few other tricks well documented in various threads.

An SL1200 can also work exceptionally well using aftermarket tonearms, especially considering use of most modern MC cartridges. Sound Supports in the UK has very affordable options for accurately mounting tonearms including the NLA Jelco original TK850S which I’ve used multiple times. Mogami W2549 based Straight DIN to RCA cables are also a great way to "cheat", especially wired with a optional external drain wire for NOT connecting the shielding to ground if your environment allows.

Record mats can also have a dramatic affect, just like peanut butter ;-) Any suitable machinist should be able to remove the raised edge lip on the platter’s face for complete freedom to experiment - also well documented in various threads. Just pay attention to not overload the original bearing/drive system with too much mass.

KAB PSU mods are an easy recommendation as are the Isonoe Sorbothane Boots from KAB.

Sarbothane or glass pads for Isonoe is not necessary. Isonoe is UK company, KAB is just a USA re-seller.
Isonoe feet without additional sarbothane boots are fine, just like on first 2 pictures on Isonoe Official Site

Just wanted to update everyone.  I received the outboard power supply and strobe disabler this week and did the upgrade last night.  Sound report?  Definitely an improvement and noticeable change.  It's difficult for me to describe specifics let alone use the poetry that typically accompanies these type of tonal improvements. 

I'll say this -- *much* quieter and lower noise floor.  Totally worth it.  

I did the upgrades over several years:
+ Tone arm rewire, RCA jacks, cotton in tonearm for stabilization 
+ DC-1200 for voltage regulation (prep for outboard power supply), TD-1200 tone arm dampening, Isonoe feet
+ SX-1200 Strobe, outboard PS.    

Overall I think the tonearm wire was probably best bang for buck and most impactful to sound quality.  It was also the biggest PITA...  but I'd do it all again.    

If I do move on from the 1200, I'd probably look for a platform that starts at $2k-$3k.  I'm not planning on doing anything atm - the 1200G / 1200GR looks interesting - so maybe in the future.  But at least for now,  I'm 100% satisfied with the whole experience of DIY style upgrades to this deck.  Great experience, and totally worth it.