Need help mounting motherboard to custom pc case

[castkevi845]

For my senior project, I decided to build a computer case, and I'm currently at the stage of working inside the case. The chassis of the tower is made from sheet tin. I'm not really into electricity, but I've heard a lot of short-circuiting your motherboard if it's not mounted correctly. I decided to mount a faulty motherboard that no longer works for measuring purposes on acrylic. I used small stand-off screws that are drilled into the motherboard, but 2 of them stick out from the other side. I've tried looking for solutions but haven't found an option besides wood which still I'm quite skeptical of the idea. I hope this isn't anything stupid, but I don't want to risk my expensive rig. I attached photos of the case and highlighted my concerns. 

 

 

[castkevi845]

Just realized that there might be a better subcategory for this topic so that you know i acknowledge that.

[RobFRaschke]

So you have no motherboard tray in the system, just the right side of the case?

[castkevi845]

Just now, RobFRaschke said:

So you have no motherboard tray in the system, just the right side of the case?

That is correct. The side panel where I want the motherboard is also enclosed and cannot be taken off just for clarity.

[RobFRaschke]

Are you hoping to adhere the poly sheet directly to the side panel to create a motherboard tray?

[castkevi845]

 

1 minute ago, RobFRaschke said:

Are you hoping to adhere the poly sheet directly to the side panel to create a motherboard tray?

Well, my first intentions were to mount the acrylic to the side panel directly but since those two standoff screws of sticking out, I'm kinda nervous about that. So now I thinking to mount something to the metal than have the acrylic mounted to that but don't know what materials to use.

[castkevi845]

Unless the standoff screws won't conduct electricity to the motherboard but I'm not sure about that.

[W-L]

3 minutes ago, castkevi845 said:

Unless the standoff screws won't conduct electricity to the motherboard but I'm not sure about that.

The standoffs will conduct and is designed to do so as an extra ground plane. As long as the stand offs are tall enough to ensure the motherboard solder joint don't make contact with a metal tray and in this case since there is an acrylic barrier there is no worry. 

[castkevi845]

2 minutes ago, W-L said:

The standoffs will conduct and is designed to do so as an extra ground plane. As long as the stand offs are tall enough to ensure the motherboard solder joint don't make contact with a metal tray and in this case since there is an acrylic barrier there is no worry. 

So, in conclusion, you're saying I can mount the acrylic to the metal with the standoff screws I have?

[W-L]

6 minutes ago, castkevi845 said:

So, in conclusion, you're saying I can mount the acrylic to the metal with the standoff screws I have?

Yes it's not a problem you can even drill and tap directly to the metal panel to mount the stand offs and not have an acrylic plate if desired. 

[castkevi845]

2 minutes ago, W-L said:

Yes it's not a problem you can even drill and tap directly to the metal panel to mount the stand offs and not have an acrylic plate if desired. 

Oh, thanks so much. I appreciated it!