Carlos, thank you so much! I have been putting the time into making the forms smooth yet doubt I will ever be able to quite polish away the marks from stretching the plastic. However the good news is that the majority of stretch marks are in the corners. I know next to nothing about vacuform but I imagine the pressure of the punch die is strong and clean enough to stretch the plastic evenly over all the surface area.
Here is my progress last night polishing and using the hot water method to smooth the corners a bit more. Note the slight occuded look from heating the plastic. That look polishes away with minimum effort.







