I am the owner of a turntable which I have made changes to. I get a lot of questions about how it looks, a lot less about the changes that more fundamentally affect its performance.
I have replaced the motor with an after market DC motor. It did what it claimed but at considerable expense relative to the materials involved. Am I paying for Origin Lives R&D costs? Or is a mature product that has sold thousands of units now just reaping large rewards for its continued success? That can be discussed for ever but, truth be told, it needed a new motor and choice was virtually none existent at the time.
The next most significant change I made was to put damping material on the sub chassis. Rigidity was not an issue with my deck. The subchassis dates back to the late 1950's when the first ones appeared on an AR deck, made of cast alloy. Apart from a slight change of geometry to accomodate an arm board rather than a dedicated arm bolted directly to the subchassis it had changed little in principle between 1957 and 1983. That helped clean the sound up quite significantly.
The third change was the replacement of the base board with 18mm MDF. This was modified to fit flush with the body of the turntable.
Finally (and most unexpectedly) replacing the feet with cones was disastrous with bass all but vanishing. Going back to soft rubber feet improved the issue and I have since settled on soft sorbothane feet.
I have not spoken about the arm changes I made because for me that falls into the domain of business as usual with my turntable. However I will state that I now use an Audio Origami PU7 and the changes made to the table have made it a suitable platform for the PU7. Thing is, had I spent that cash on a new turntable or a quality second hand table from Michell, SME, Avid or any number of others I would have an equally desireble table that would certainly perform better and actually retain its value, unlike the money I have spent on mine. Despite the time, and energy I have invested in my table, not to mention money it is still an AR Legend, value somewhere between £60 and £160.