The positive attributes about ABS include its affordability, strength and rigidity in 3/16" thickness. The bad thing about ABS is that it may be too strong, it won't shatter like plywood with an off-track excursion (plywood splitters are used by the pro Lotus race teams).
The ABS plastic was obtained from Tap plastics. For a 60"x24" sheet, the cost was about $60. The plastic is stiff but easily cut (slowly!) with a 17-24 tpi jigsaw blade.
To mount the splitter, lightweight PVC blocks were cut and glued to the ABS to enable a flush mount with the clam. Some of the mounting holes were shared between the ForcedFed spoiler and the splitter. The forward-most mounting holes required 5-0.8 x 50mm long bolts. Other holes required only 40mm or 30mm bolts.
Post-installation note: discovered that APR designed aluminum rails to attach their CF front splitter to the front subfrae- this will protect the clam from damage in on off-track shunt. I'll have to retrofit the ABS splitter to fit the aluminum rails when i get the APR CF splitter (using the ABS splitter on the street while reserving the CF splitter for track use).
