New to Salt Yachts with Various Questions

[lowride14]

Hello everyone, Iv just recently acquired a 1962 38' Hunter Sedan "escape", and i'm going to be joining the livaboard lifestyle in the near future beginning in Vancouver and then moving out to Victoria. i'v been reading these forums for a while and now i'v have a variety of questions.

1 So i'm going to be living on it through the winter and i was thinking of the best way to heat it, maybe a wood or fuel stove/heater installed in the saloon (saloon is different from the dinette right?) but i'm wondering about cutting holes in the roof for the chimney? and also i was thinking of getting a propane heater in there, less permanent and just having the door cracked or something. its pretty drafty in there already, but i am planning on taking care of that over the next while. maybe put a fan in to move the warm air around. Wondering also if you can buy low oxygen warning units?

2 If you look at the picture of the inside of the saloon/helm right above my buddy there is a hole in the roof, it goes right through but has been glassed over in the last little while.I'm wondering what that could have been from? last owner said he used to have a mast that he took down but i dont know if that would have been from that or not.

2.1 part two of this question is there is another hole on top of the bow thats been glassed over and i can see it inside the vberth, its closer to the anchor locker on the left side?

3 Since he had removed the mast what do you folks recommend i use to mount my antennas, and gps transmitter/receiver, and stern light?

I'm sure i'v got plenty more questions, but lets start with that ahaha.