They are working on a chow manned mission to Mars.
( not sorry )
You want a Chow Mein stage with rocket noodles - spicy one that heat comes from, with some spring roll boosters?
your point being?
the thing is - this is all assuming the chinese want to do whatever it is the americans are doing with the X-37. so unless their aims are the same, it's all a massive speculation. I'd bet nothing the US are doing with the X-37 couldn't be done with a capsule you could recover on land (the only reason their manned spaceships have landed at sea is that it's a softer landing - the russians got around that by initially ejecting the cosmonaut in Vostok when they reached a suitable altitude and had them come down by parachute, then in subsequent flights by having a landing rocket fire a couple of seconds before the capsule reached the ground, cushioning the impact. not nearly as much of an issue for an unmanned craft) and the costs wouldn't probably be that much different.
I thought the reason Soviet spacecraft landed on land was because of their land mass, and the Americans recovered them at sea because they had the naval forces to do so - and it was helpful to remind the Soviets of that.