I upgraded Jessie to a secondhand Hamster Heaven about a month ago and we're literally just using the cage itself and don't have any of the additions that originally came with it. We've blocked off the tubes (they're compatible with the Ferplast caps too) and have just added Jessie's own freestanding level from her previous cage.
It's a good sturdy cage and that large front door has been a blessing when getting Jessie in and out for playtime.
Here's Jessie's set up...
She's a small Chinese so you'd need a bigger wheel for a fully grown Syrian.