Well, I don't like picking apart other people's eating plans. I don't know the breakdown of ensure, but I'm assuming it has adequate protein. Overall, the plan doesn't look bad. I'd keep an eye on the starch (rice and potatoe) proportions in the evening meal though.
Rather than pick it apart, I'm going to point you to some good info to make up your own mind, that will allow a lot of flexibility.
1. Take the link from this site's main page to the nutrition section. It's very well grounded, and written by one of the fields leading experts (Dr. Serrano)
2. Simpler version by D. Berardi
http://www.johnberardi.com/articles/nut ... habits.htm
http://www.johnberardi.com/articles/nut ... ting_2.htm
These should give you some good basics to develope your own plans.
As to the transformation goals, I'd suggest going to the beginner's page, reading it all over carefully, then go on to the weight training section and pick a good beginning program to fit your needs. I'd suggest full body or upper lower split. Then on the the aerobics and HIIT setions and find something you can work with. You have to loose fat all over and tighten your trunk area before you can "flatten" your stomach.