Yes, the TS-style walls (and even destroyed & permanently-lowered gates) are available as map objects. But apparently when EA was playing around with walls in C&C3 they opted for a different approach.
It makes sense, to a degree, since the BFMEII wall system is "hub" based, allowing joints of any angle or multiplicity, but the TS walls didn't really have "hubs" of any sort, and they were very 90-degree-angle oriented.