As a matter of fact I have sent PM to TDW, too about additional graphic file for his mod but haven't heard back from him...
Is the picture in post #17 the final version?
I like the graphics in your file but IMO the "pipes" under the dials looked better in the first version. If you take a look at the original SH4 GUI these parts are actually "clickable" (i.e. change between normal/mouse-over/clicked images).
For some reason the original version set those "pipes" little bit more apart from the rest of the GUI. Hard to explain but I hope you understand what I mean...