adult set up help please!

hello everyone!

this may be a silly request but i was wondering if anyone could help me figure out where to place everything in my corn snake’s new enclosure? i was gifted the vivarium, but i’m not sure it was originally made specifically for snakes as there may be a lack of cable holes for the equipment. i got everything i was told that’s needed at the reptile shop, but i’m aware we may need to drill additional holes and such. i’ve attached pictures of the inside of the vivarium, the only two cable holes are located at the top on either side and are quite small. there’s also two air vents. it’s a double glass sliding door which we have purchased a jewellery lock for. any help and/or advice would be much appreciated as we’re hoping to get her moved in there asap. thankyou so much!