Thomas you are an ASM wizard! Thank you, these modifications worked perfectly. And bonus optimizations are always welcome .
The Graphics section on the site hosts a wide variety of content and is a great place to begin. In fact, the On/Off blocks you're looking for are hosted here already.
Here you go: Super Mario Maker 2 - Super Mario World - ON/OFF Blocks
The pipe graphics pictured are already found in vanilla SMW. I'm assuming you're looking to add screen scrolling pipes into your hack. To do that, you'll need a tool called Gopher Popcorn Stew (GPS for short), and custom blocks to go with it.
Custom blocks can be found in the Blocks section. The ones you'll need for the pipes are called Screen Scrolling Pipes.
If you're unsure how to insert custom blocks, this tutorial here will be helpful.
I hope that helps!
EDIT: ninja'd