In reply to VictorM:
You'll spend far more time and learn far more (DIY) making it than you will using it.
The art in placing gear, nuts especially, is understanding the possible directions of loading then finding the best features in the rock to suit what you have available. Also developing good judgement as to which features are independant or linked so a failure of one doesn't compromise the other. Dropping a nut or three into a wooden V or clipping a bolt is thoughtless, mechanical after the first try, you learn nothing worth the effort of making the thing.
The various options for equalising and organising your belay can be practiced with slings around anything robust as anchors, door handles, stair rails, an upended table etc
jk