We chose not to have "sleeping quarters" for our Jardine's as we were told that they tend to like to burrow/hang out in there and can be hard to get out of. He was happy just sleeping on a higher perch and we put a cover over the cage at night.
One idea: We often had him on/near our desk as we worked
(be sure to guard that keyboard and wrap cords) and my crafty husband made a little "house" with an open front and back
that while we were working our Jardine's liked to play in
or sleep in
...and we sometimes took him to Starbucks with us if we were going to be there a while (we found it helped socialize him).
Toys-wise, these guys are chewers so get lots of wooden stuff, which they'll go through quickly. I would collect wooden chopsticks for him. And foot toys (especially with bells inside) -- they love being on their backs. Ours loved the Star Munch Foot Toy and would rip it apart within a day. He also loved playing catch. Well, throwing things as far as possible and then watching us pick them up. He didn't seem to catch onto foraging toys but maybe he didn't get enough time to.
He also liked hanging out on a small bungee "boing" we had in his cage and the larger, heavier one we kept over the kitchen eating counter for him.
Good luck and keep updating about your progress -- there aren't that many Jardine's relatively. Our baby died just a few days after your post and we're still grieving and slowly looking for a reputable breeder.