Help applying boolean mod and creating face in Blender

Job ID: 37817199

Budget: $10 – $30 USD

I am designing a computer case, and am trying to create mounting holes. I used to do 3D graphic design, but haven't used the software in 15 years, and am having difficulty getting the boolean difference mod to apply.

I have two Blender files, and have attached pictures showing them. One file has 4 cylinders, and I need to cut a hole the size of the cylinders out of the bigger piece.

Another file has 10 cylinders, and the 2D rectangle has no faces because I deleted some inner vertices. I need to recreate the face, and also to apply the boolean mod.

I hope I explained it clearly, if you are able to help, please include the word "chair" in your bid so I know you've read the description and can complete the project for the amount bid.
Related categories: 3D Design Blender