I've attached a PDF of the JSON file I created, leveraging from Lulzbot 's Cura for Taz and the lulzbot_taz5.stl bed I downloaded. I put these into the Cura resources folders (definitions and meshes), restarted Cura and selected a new printer from the non-network list under Lulzbot. Then I went into printer set up to verify/correct any info - mostly nozzle which is 0.5mm and filament diameter. Created 3 profiles - 1.75, 2.85 and 3.00.
I did have to create my own print profiles based upon Lulzbot's profiles and have those as well.
lulzbot_taz5.def.json.pdf
lulzbot_taz5.stl