OK, I'm sold! I just ordered two of the kits for my grandson and I to assemble/test. I have never spent much time with radio circuits and my grandson is just starting EE school so he can use the practice.
You can get some decent scopes on eBay if you look for long time sellers offering a return policy. Some will be just cleaned up, some will be tested and verified and the higher priced scopes will be calibrated.
I bought a Tektronix 485 about 12 years ago and it has worked perfect. I paid about $200. The only one I see on eBay that is worth postage is going for $650. The rest are junk!
http://www.ebay.com/itm/Tektronix-485-Dual-Trace-350-MHz-Portable-Oscilloscope-/130682265274Although I like analog scopes, I just bought a Rigol DS1054Z and the extra features make all these used scopes a waste of money. Yes, if I needed more than 100 MHz, I might look again but too many people are buying used analog scopes and winding up with junk. Look at all the descriptions that read "Sold for parts", "Powers up but...". And I already have a fully functional 350 MHz scope (with no advanced features).
If your hobby is going to take you anywhere, you will need a decent scope. I would think 100 MHz is about the lower limit on bandwidth and, personally, I want 4 channels more than any other feature.
That is a great project! I am looking forward to my kits getting here next week.