insulation

Has anyone fabricated storage boxes to fit under the rear clip on the SPF MKI Cars? I'm considering making some with appropriate insulation and wondered if there are plans, mounting thoughts already out there? Thanks Cameron

I have seen several posts about stick on sound insulation but haven't seen any on spray on. I have used Lizard Skin in the past for both sound and heat insulation with good results. Has anyone used this on an SL-C and were there any issues?