Outer Limits 4x4 Board

Can someone give me pics and dimensions to make an auxillary battery cradle for a 100series with the 1HZ.. I dont see a point in payin nearly $200 for a cradle when i can get a dual batt kit for $150 off ebay without the cradle.. Surely the isolators n wiring have to be more expensive

My 105 has the provision allready there, all i needed was the plastic tray and the clamp, all up about $15 from toyota. Maybe the 100 series are different