You may want to consider spending more time in the different models. You might find one that works well for you wo significant modifications. The modifications you talk about would not be very cost effective especially the bathroom mods. There are a growing number of models with king size beds that give one more flexibility and less need for the famous "crawlover" which for us is less of an issue.
Good luck, all in all TM's offer many advantages for a towable RV.
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