Is it difficult to strip the burner off its external enclosure and make it an internal DVD burner?[/quote]It depends on the enclosure. Some (like Samsung or LG retail external drives) are nearly impossible to open without damage, some others are assemled with screws and can be rather easily opened. You just have to be careful to locate the screws and remove them.
After you have “freed” the drive, there shouldn’t be a problem to install them internally.
Thank you for any advice and opinion.