Last night I addressed the only major / easily noticeable flaw in the interior; the shift boot. In the pictures above you can see how the original looked after 25 years.
This is an OEM Audi S4 boot. You'll notice that it has a plastic ring at the tip where the leather terminates instead of your typical folded and sewn seam. I had to take a dremel to the inside of the plastic ring to bore it out a bit since it's inner diameter was too small for the AW11 lever.
I was lucky that the retaining clips for the boot were not broken. I simply trimmed the original boot off of the wire frame and stretched the new boot over it. The S4 boot was a bit small but I was able to make it work with some muscle and patience. You'll also notice that the boot it a taller than needed so it looks baggy right now.
The OEM Toyota shift knob is long compared to most aftermarket pieces. You can see in this picture how far down the boot has to sit because of it.
Once I get a knob that doesn't shroud over the shaft by an inch and a half, the sag in the boot will look more like this:
