Here’s the Fret scale calculator: https://www.stewmac.com/fret-calculator/

Tony, to build a weed whacker bass, just make it the same way you would a regular cigar box guitar, but make the neck longer, use bass tuners & weed whacker string, it’s that easy? Scale length is 30” get a template from the Stewmac scale length calculator? String gauges are: .080 / .065 - 2 string   .080 / .065 / .050 - 3 string  very easy, don’t overthink it?

Never met Dave in person, but had many chats online…have not made a canto…but look under resources tab…there is a section of free plans

Lots of plans in the Resources tab, take these plans & convert them to Bass (30” scale length) https://www.cigarboxnation.com/page/build-a-3-string-cigar-box-guitar

Never got to meet Dave Lynas, was in Duluth once, but schedules didn’t work. After Dave passed away, I called this shop that sold his pottery. Went to Duluth, used GPS to find the place. But somehow wrong street name was entered. I ended up at a private residence that I thought was someone selling crafts out of house. knocked on door and stepped in…then realized I made mistake and was standing in a living room.  Hurried back to car, this guy comes out in a bathrobe wondering what was going on. Think Dave would have got a laugh out of that

Seeing this pic in your album, you know how to build an instrument already, jus build the same thing with a 30” scale length & use .095/.080/.065//.050 weed whacker line for the strings? It’s that easy?

Upright:

4 string:

Easiest: 

Anthony, Weed whacker strings is what you’re looking for: .095/.080/.065/.050 are the gauges?

Good.  I would think his would be about the best.

Tony, you put me onto a good idea.  Or at least I think it is.  Search out Mike Orr on FB and message him with what you need.  If for some reason that does not work, message me. I kind of forgot that I am FB friends with Mike.

You are pretty much a miracle, Tony.  Great blessings after being so low.   Same here.  Winter of 17' I hurt my back bad and had horrible pain.  It looked like I might not ever walk more than 30 feet at a time.  Lots of prayer and time and I got better.  

Hi Tony. The add is spread across the top of CBN banner at the very top. Touch it and wallah. You can scroll down to the sale jacks. Easy Beans Friend.

Oh!  You are Dave's buddy, Tony.  I think I've heard your on videos and for sure like that potato chip bass and the crooked neck eagle head build. It's good to have you for a CBN friend.

Hi Tony. You have Mike Orr’s address for fret boards. The necks come from eBay under cigar box parts, necks. Look for them there. I’ll be over tonight to see how it went. ... Dave

Some hefty looking Potato chip can (BASS) is it? do you have a sound sample of it ?

Hi Anthony, I think it was a comment on a video of mine that I liked! And if I remember, your a friend and neighbor of Dave Lynas.