I just modified a Jinma sub frame to fit a Branson 3510. I bought a YW-6 hoe and am adapting it to my Branson. Basicly I cut the rear 2' off the sub frame and added 2" X 3" tubing to the sides and made new front brackets.
Haven't got it hooked up yet, still working on the plumbing. Dealing with the metric fittings and best way to hook up to Branson hydraulics..
I did a google for Jinma Backhoe and found a site that showed having to beef up the sub frame to make it useable. They added box tubing to the under side. The frame I got would not have worked very well. It looked too weak at the rear attach pins.