The Ukulele comes in Soprano, Concert or Tenor, and you can have acoustic or electro-acoustic. They all have the same design of cigar box with an elephant on, (and I doubt tobacco has ever been involved?).Now I have one, (and I got the Tenor because it was only 5€ more than the Concert) I don't know if I will have a go at making my own, but it seems a lot less likely now.
The 40 is the top of the range and include a Chorus effect as part of the electrics - It wasn't that I want this effect but the 40 range was all I could get in Europe - however it can add a certain something? if you switch it on.