I also have a 2010 Regency 29 GT. While I have not attempted to replace the TV, I have made a few other modifications. If you haven't done so, I would suggest you call the Triple E factory and speak to Brad Wall. They have been very good at getting back to me with answer's to my questions. It will probably save you some time and effort.
Since we both have the same RV (and there does not appear to be many of us) I would like to stay in touch with you to discuss any issue's or modifications in the future. Not quite sure how to get you my personal e-mail address but I'll try to figure it it.
Good luck with your project.