There is indeed lots to read.
I thought I might have a stab at creating a C4SL residential receptor by modifying the original receptor details but its not easy. Consumption rates for vegetables will vary depending on what chemical you're assessing; for arsenic the child eats at the 90th%ile rate for green veg and tree fruit and the mean rate for the other food types but for lead the child eats the 90%ile for green veg and tubers and the mean for the others; so you can't assess arsenic and lead together in the same model because the food ingestion rates vary.
The practicalities are quite interesting if you try and relate the model to the real world where a garden contains all the metals:
Arsenic (greens & tree fruit)
Lead (greens and spuds)
Cr6+ (roots and tree fruit)
Cadmium (Roots and Spuds)
the hapless child has to change its consumption rates for each of these. I can see why the C4SL version of CLEA hasn't been published
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