Please don't. You will ruin any chance for repair or modification at a further point.
Not a bad idea. I however don't think it's worth the bother, and a good arm re-wire gets you 90% of the way there.
Have you seen this? --
http://theartofsound.net/forum/showt...165#post462165
The Acromat is fantastic, I love it and wouldn't think of using the Techie without it. I have no experience with the Isoplatmat.
If using a DL103, more headshell mass is a good thing.
Sweet mother of god, yes. The stock feet are complete rubbish, and even placing vibrapods under them makes a noticeable improvement. I've used that, sorbothane hemispheres, and Isonoes, the Isonoes are far and away the best. I read that you don't care for the looks of them, I strongly invite you to reconsider. Their performance is exemplary.
Sure. try what you think might make a difference and see what happens. I'm sure of you find improvements we would love to know.
This is the biggest bang for the money -
http://theartofsound.net/forum/showt...wer-Supply-DIY
Here's a less prototypey version -
http://theartofsound.net/forum/showt...-amp-Regulator
In order of importance, IMO
Mat and Feet (equally important)
PSU
Arm re-wire
In your case, getting suitable mass into the arm (heavier headshell) is also very important, to give proper balance against the DL103 stiffer cantilever.