Electrical Conduit Box (Pull Box) Extension

I needed to cleanup the four sets of Cat5 coming from the outside of my house and entering my crawlspace since Sun/UV & rodents appear to love the flavor of my families web browsers. Well I decided to place the exposed wires in PVC conduit and the corner pull box I bought was no where near large enough as you can see in the picture. Rather than break all the connections again and buy a larger box I found RogerBelks design that was almost the exact same. I did some quick rework to make a box extension. Size wise it's a perfect fit (accounting for ABS shrinkage if that's what you use like me, I used a scale of 100.5%) The first and only pass at making this was done with a height of 20mm, which turned out to be to small for me so I scaled the Z up to 175% or 35mm as seen in the photo. To keep things water tight I applied a thin skin of silicone between the extension and the box and left the gasket on the lid as normal then used longer screws.