If you can gain access to a welder with a helper you can't beat the price value of the 4x4 labs.
Otherwise I'd probably try to sell that one and just buy a complete bumper like you want. Modifying stuff can become more hassle than its worth often. Especially by the hour.
Speski OffRoad LTD, Cargo Solutions for Toyota 4x4's http://www.SpeskiOffRoad.com
"80 series, with a fridge"
1976 FJ40, Project with little progress.
2004 Starcraft 10RT