Perhaps, especially if if the modification was offered as being reversible!
Also, if someone else whose modded Techincs and system I knew well (say Martin T or DarrenHW) were to go down that route, and I liked what I heard when comparing their T/Ts to mine, in their systems (or in my own), I'd be much more inclined to modify the plinth, as the process and sonic results achievable would be less of an unknown factor. Otherwise, it's simply not something I'd be willing to take a punt on.
I also happen to think that the stock plinth is well thought out and executed, and once free from being influenced by restrictive factors elsewhere within the design of the T/T, is significantly responsible for producing a sound that I like.
Essentially, the plinth certainly doesn't seem to be doing anything wrong, to my ears, or indeed significantly holding back its performance such that it is unable to compete with some of today's top T/T designs, in some cases which cost many thousands of pounds more than I've spent on my T/T....
Marco.