So, I got a couple of comments on the TCC board that may or may not have any value.
Bulkiness and the safety of the tip on the next branch over.
I agree that the wire sticking in out the front may be a little bulky and may get on the way but for park trees like the ones shown in your video I think it would work great.
To the issue of the tip on the next branch I assume this was done just to show and make the point of how easy it is to retrieve the throwbag from a far away distance and not to show proper climbing techniques!
I assume that every climber should consider the safety of the next tip before fully loading it and before releasing the connection to the initial TIP while making the transfer. So that is not a valid concern in my view.
I still have not made one but I definitely think It can be made with the simple tools and scrap wood in my garage at a very reasonable cost.
I paid a lot more than that for my "Retreever" from Sherrills and now I do not even use it! Ouch!
So, I still think it is a good idea and I look forward to make one and give it a test in the field to see if it works as well as the one in the video. How about the name I came up with? it kind of rhymes with the other acronyms we use SRT, DRT, DbRT, DTBR!