Mate u won't do it in one piece.. And still look presentable!!Especially with that #OOPS# quick grip stuff. You'll need to make it into a few panels..

To cover cracks either a layer of bog or even a layer of foam.. Either way it's gonna be hard to do it in one piece..

I worked as a trimmer in probably the best or one of the few custom modification work shops in Australia and learnt a lot.. Trimming isn't as easy as putting glue down on both surfaces and then sticking them together.. There's a #OOPS#load more to it