Following both Docflaco and Mobius97's excellent instructions, as well as the Lotus service notes, I upgraded using the same components listed in the first post here. I was a little familiar with the clips design having removed the interior years ago on my 2009 Elise, but it's still a bit of a shock when they do release. As posted you do not have to remove the
door panels completely but just rotate them and rest them on the floor and against the door.
Two things: the driver's door panel clips were covered in a small tab of fabric or tape, but the passenger side tabs were not. Assuming this was done for better fit, ease of installation. More importantly, I didn't see the 15 piece tool set, so I bought the 18 piece and glad I did, as it includes a plastic rivet removal tool (see photos) which made this part of the job much easier.
You will need a soldering iron, too.
I see that a larger front speaker (deeper) could certainly fit, but these two changes (speaker and amp) make a substantial difference. If I can do it, you can.