| I look at Bottesini as having, depending on the edition, a very short intro, then an exposition stating the 1st theme 2x, the 2nd time transitioning from am to the polar key of FM, then theres development up until the first set of arpeggios that end with the high harmonic passage. Then its like a recapitulation until the cadenza; finally, the quick coda at the end to finish it. Its a sonata form more free, in the form of the Romantics. Furthermore, look at opera pieces, I'm sure there are some da-capo-arias you could compare it to, seeing as Bottesini loved to make basses into opera singers.
Hope this helps,
SSS | 
