Hi all. I posted an initial post a few weeks ago to see if this is something I want to do and I think I can handle it. I have run wires through attic and crawl spaces before for other things and can patch my own holes. And I work in the IT field so hopefully the technical aspect will be something I can handle too. So I think I may go more toward a hardwired system rather than wireless to save a lot of money. So here is the layout of the house:

First off, there was an existing system in the house. The panel was mounted in the main floor closet that is shown in the diagram and there is a cluster of wires going to it. Using a continuity tester, I have traced wires going to the recessed sensors in the two sliders in the family room and to the front door (to the left of the kitchen). There was also a motion sensor located in the lower left corner of the larger bedroom in the basement and one in the hallway on the main floor (it doesnt really show on the diagram but it is right above the doorway going into the mater bedroom). I got rid of the sensors a couple years ago but the wires remain there and I tested them and they are all good. There is also a wire running to where the keypad used to be, which is in that small hallway where the front door is.
So from that, does that all sound like it is fine to reuse and to mount the panel in that closet again? I don't know how old those sensors are in the door, but they worked when I opened and closed them and had the tester on them. Do those type of magnetic recessed sensors have a life span?
My first order of business would be just to get those existing doors hooked up and to hook that basement door up. Then as I have time, I will probably add sensors to all of the windows as follows:
The family room has 5 tall vinyl windows with sliders at the bottom. I can run wires to those easily because there is a crawl space below them. The kitchen also has a vinyl window and I should be able to run a wire pretty easily to it. Can you point me to a link for a good sensor to use in vinyl sliding windows?
The rest of the house has all old wood casement windows that I plan to replace eventually. I may not get to some of them for awhile, so I might end up putting sensors on them anyways for now. The living room and the two bedrooms next to the living room all have windows that don't open or are at the 2nd story from the point they are and would need a ladder to access them so they don't need sensors. That leaves the master bedroom, the bathroom, and the basement. If you could either point me in the direction of a window sensor that works well for wood crank out windows, or, if you could show me good motion sesnor locations for now, that might be another option. I am a little leary on motion sensors as I am afraid of false alarms, but if they are pretty reliable, I might use some.
The basement door is double all glass french doors. Is it best to put a recessed sensor in each door, or just the one that opens first? Do I need a glass breakage sensor, or do people typically open doors or windows once they break the glass in them?
The other question I have is for the siren locations. I have a good place outside up on the roof to mount one, but where is a good inside location? Wouldn't an inside siren be very easy for someone to disable by just smashing it?
Where is a good place to plug in the transformer? Do you want that in a somewhat hidden or tough to access place?
Finally, there is no access from the garage to the house. There is just that man door in the diagram and the big door. I might put a sensor on that door to protect the garage. Also, we typically park the car in the garage and just go to the house without using that man door. Is it a good idea to put a keypad in the garage? Is it necessary to have 2 keypads? I know a lot of people put one in the bedroom, but since my bedroom is pretty close to the front door, is that necessary?
In summary, I want to at least get the existing doors and that basement door set up for now so the main entry points are protected. Then I can add the rest as I have time. Any input on anything is helpful (such as what types of sensors to use, where to place them, etc.). I'm not set on a system or anything either, but have been checking out ones such as the Vista 20. I look forward to hearing from you and to start this project!
Edit: Image size and location