In reply to slowbird :
With regards to question one, parts you sell from car B would just be part of recoup, up to the $500 you spent on it. Even though it's a parts car for another car, and assuming that some parts on it made their way on car A.
For example my 323 was $100
My escort gt was effectively $7 and change (I traded a 4 pack of craft beer valued at $16 for it and there was $8.78 in change in the car
My protege lx parts car was $350
I'm swapping the BP05, G series transmission, power mirrors and rear disc conve from the protege into the 323.
I swapped the battery tray and used the motor mounts (filled with 3M window weld) and one of the rear calipers from the protege on the escort (meaning a new rear caliper will in turn be on the 323 budget when I do the rear disc conversion)
Based on the amount of items from the protege used on the 323 versus the escort, I'm assigning a value of $325 dollars to the 323 and $25 to the escort, but I'm open to adjustment of $300 to the 323 and $50 to the escort as well.
All of this is prior to recoup on the protege. But it allows for percentages and ratios to be figured as to where protege recoup will go.
Every $25 of the protege purchase is 7.1428 percent of it's purchase price. Right now based upon weight, if I scrapped what remains, I was get $212, of that 212, $15.13 would be eligible to recoup against the value of protege parts on the escort and $196.85 would go back towards the value of protege parts on the 323.
I'm recouping value against the protege parts car. But the allocation of parts is already split towards two separate builds. And the recoup is also split amongst to 2 separate builds based upon the previously noted percentages and values. (And the escort gets a tube of window weld in it's budget)