Originally Posted by OneIsAllYouNeed

Light Bicycle rims are great. The "road" wheelset on my tandem, single, and wife's single all have LB rims.
That hub selection would be a poor fit for your tandem. Your frame is meant for 145mm quick release hubs. The DT 240 is a 142mm x 12mm thru axle hub. They're different standards. If you converted the 142x12 hub to quick release, it would end up being a 135mm wide hub (10mm narrower than you need) because of the difference in quick release and thru axle standards. There's a hack that'll let you use 148mm x 12mmm thru axle hubs on a 145mm quick release frame, but the disc mount on the hub ends up being 4mm off from standard. Your safest bet is to use a real tandem hub meant for 145mm quick release spacing. I'm a huge fan of White Industries XMRT hubs -- I have two wheelsets with them for my tandem.
For the rest of the wheelset, I'm wary of the low spoke count. 28 is likely fine; 32 is plenty. It's also not clear what spokes you'd be getting. Sapim makes weight weenie spokes, heavy duty spokes, and everything in between.