LEE Nicholson and Michael Dalkin have proved they are model inmates.
The two, who are serving sentences at Kirklevington prison, near Yarm, have built a scale model of Stockton's Princess Diana Bridge.
The steel structure has been installed at Nature's World, Middlesbrough, spanning the botanical centre's representation of the River Tees.
It took them more than four weeks to cut, weld, build and paint the 14ft model.
At 2ft, it is wide and strong enough to carry people as they cross the river.
The project formed part of the men's community and resettlement work.
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