Some great photos there, thanks. I went through Sumbawa in late 2011, on my way to Thailand, from Australia. I'd spent a fair bit of time dawdling around Timor-Leste, the West Timor, Rote, Flores, Komodo and Rinca islands. I'd heard some negativity about Sumbawa, mainly driven I think by people complaining that it was a "dry" island - ie, no alcohol sales except at one international hotel.
I found the island fascinating and I'm still in occasional touch with some of the people I met there. The main road was in the process of being upgraded under an Australian Aid project - from 6 metres wide to 8 metres, IIRC.
It got a bit bumpy at times
You mention traditional boatbuilding. I saw this one under construction and was tempted to find a canal crossing and go take a look. I would have if they'd been working on it at the time....
This was about as close as I got to Tambora. I had intended to take a look... but missed a turn with the roadworks, got to here, saw the water. which exposed my error.... and kept going
A local cop trying on my Super Enduro for size
I think my size had this local lady a bit bewildered too....
I'd love to get back over that way. Somewhat difficult in current times. I think my favourites in Indonesia were Flores and Sumatra though. I didn't get up to Kalimantan. My most recent trip was, sheesh, November 2017 and restricted to Jakarta and western Java. How time flies.