In an effort to reduce cabin temps I insulated the sills and also put insulation under the carpeted area on the vertical portion of the sills. The aluminum was left exposed. This was effective without changing the look of the interior.
2005 Elise Burgundy. Touring Pack, Twin Oil Coolers, Larini SE Exhaust, TRD Cup Airbox, LETSLA, BWR Bar, Team Dynamic 1.2 with Toyo R1R.