Pretty close to pushing the button on buying a 3500 extended window van. Does anyone have any experience with a conversion on this model? I like that the glass goes all the way around, but am considering the possibility that it will get in the way of the internal construction of the conversion. Would it be better if I just bought the standard cargo van and installed some windows later? I'm not opposed to cutting into the van if I need to, but I just liked the idea of all the windows already being there. Thoughts?