There are many options for changing the look of your house. I would replace the windows with larger windows. You can put in tall windows and keep the same width. This doesn't require any structural changes. If you widen the windows you will need a structual analysis. However, if you want to really change the look, you could widen the openings and put in french doors on each side with a new balcony for each, or a balcony across the front. The balcony can be very shallow 6" or deep enough for a chair. It can be cantelevered. I would go for a contemporary look. I found some images to share for inspiration. If you decide to make the changes, I suggest that you hire a local Architect to help you acheive something really nice..........Your house has a lot of potential.

It sounds lovely. The ceiling will be more than suitable for a transitional style. I think the wainscoting would also be fine but as I'm cautious I'd be adding after I'd lived there for a while. It does seem more traditional than transitional. On the other side I'd love the bead boarding in the hall.

Personally I would save the room you want done the most until last - often during renovations, whether you're doing it yourself or paying someone, you still get sick of the mess, having other people in your home every day etc and what happens is you finish one room and want a break which can lead on to eith takgin months or not getting the last rooms done at all. If the last room is the one most important to you, you will continue on until that one is completed and this gives a much better feeling of satisfaction than doing that room first because you have that build up of anticipation.

may be it's a septic tank?