I agree with Michael Karas' answer.
Instead of rearranging the rooms, I think it would be better to leave the kitchen where it is. To do what you are proposing is a major task, and in my opinion is not necessary.
It typically is not a good design to have the front entry open directly to the kitchen. There are very few homes that have that kind of layout. Your current layout is actually pretty close to ideal.
I think the best bang for your buck would be to open up the wall in between the kitchen and the dining area. As Michael already noted, this might be a bearing wall. It is not possible to tell whether that wall is a bearing wall, or a partition wall just by looking at the blue print.
I would recommend that you hire an engineer to look at the wall and see if it is a bearing wall. If it is, then you would have to modify the framing and most likely install a beam to carry the weight.
This will do two things. The first is that it will open up your kitchen area to the dining area so you don't have to go down the hall and through your lounge area to go from the kitchen to the dining area. That is pretty inconvenient, especially if you have guests. It will also give you the opportunity to expand the size of your kitchen.
This also has the advantage of letting you leave the plumbing fixtures in place. To make the changes you are proposing would dramatically increase the cost of this renovation. If you just opened up the kitchen wall, the cost of this renovation would be much more affordable.
I would also recommend partially closing off the wall in between the dining area and the lounge. A set of french doors, or something similar would work well there. This would make the dining area a little bit more formal. It would also allow you to expand the size of the kitchen.