i personally think do away with the butchering, get a air cut off tool, with a small razer sharp metal cutting disc, and cut out the inner rear guard, leaving the outer skin, and get out your hammer and dolly! cutting and fiberglass and silicone really looks like a average job and what happens to fiberglass? it doesnt like to flex so get a lit tap and it will crack so will your 1inch of bog, all u should need is a light layer of bog to fill the imperfections, u can see how good u can get the guards without cutting them up. ill post some pics when i do the sprinter