I should have a sig file that says something like this:
I am not a wrencher. I have never been a wrencher. I have no tools, space or ability to work on my car whatsoever. I'm lucky I can wash it without causing damage.
Seriously- Not everyone has the skills that 99.9% of the members of this forum have. I must be the only one who falls outside of this category.
You said that is been to the dealer twice, but did they tell you what they checked? Did they write it up on the repair ticket? There are lots of places on this car that can hide bits and pieces to make noises, maybe the dealer didn't open the right panels or look in the right places; dealership mechanics are not always the most motivated individuals in the world.
Perhaps you could compare what the dealer did to some of the suggestions that the forum members are suggesting and you could ask the dealer to check there if those are beyond your capabilities.
I don't want to sound like it can't be done, but if your personal mechanical skills are what you say, you might become well acquainted with the employees at the dealer, and Elise might be a bit expensive to own.
2005 Ardent Red Elise, Gut Sport wing & splitter, custom diffuser, Sector111: DSBrace, gPan3, subStuffy2, Larini Sport muffler, decat pipe, Schroth Racing 5 pts, wheel studs, Team Dynamics 1.2 with Hoosier A6s, Koldflash 200 ECU flash, BOE rear clam hinge, BC Racing single adjustables, Hawk pads, SS Brake Lines, HID lights, custom tail and high mount brake light...and much more...