Thanks for bday wishes!
The souldier straps are just normal guitar straps. Their openings for the endpins are tiny, so I do a little surgery with a knife before attaching. Most of my ukes have end pins for connecting straps. To attach the strap to the headstock, I use a Martin leather pin adapter that wraps around the headstock and attaches to the strap. For a smaller strap, there are some nice mandolin straps around too.
Dom, the Kustom amp was from Thomann.de, and it's a Kustom Sienna 35. I'm using a Harley Benton GA5 and a cheap preamp to good effect now though, and then a Vox DA5 if I want effects. It ended up being cheaper than getting a decent chorus/reverb.
Better late than never!