Bungs or no bungs for removable top?

This is my first build and i am assembling materials.

I scored some refurbished barrels with removable lids, but the lids have screw in bungs. Is that a problem?

Can I use this style lid as the top of an RMH barrel?
If so, do I need to do anything special to seal the screw-in caps?

Or, do I need to find a smooth, blank lid with no orifices?

Or, since finding a blank one is unlikely, should I just forget about having a removable top, cut the lid end off, flip the barrel and use the bottom as the RMH top?

Thank you.

Hi Peter;   Welcome to Permies! And a Big Welcome to the wonderful world of Rocket Science!

Absolutely use your barrel with the removable lid up!  You really want to be able to inspect your riser at will without removing the barrel.
Those bungs need to be removed and checked for plastic gaskets , quite a few have them and they need to be removed.   Retort cement (rutland) will seal them up .

Let us know what your plans are and please include pictures when you get started!

Our happy crew of rocket scientists are eagerly awaiting your questions.

Hey Thomas!  Thank you for the warm welcome, and the welcome advice. That’s good news that I can use what I scrounged. Your rocket crew, as pictured, does inspire confidence.

I’ll start a new thread with my plans. Advice welcome.