SHOUT OUT TO BUNNYMEISTER. We work together on some projects and hes uploading cool stuff. I highly recommend you check him out.

Press Q, and get the items, do you have halflife 2? It may be in the comic props section.

You have to weld multiple objects onto the top of an explosive barrel, and then you can customise with trails and the objects on top of the barrel, colors, styles, materials, etc. So yeah, you have to weld everything together. Also, if you want yours to float up and down and press a button to blow it up, add tnt and your own hoverball. If you want, you can just use mine though. :)

Just a little fun project that I did, hope you guys and gals like it.