There are a couple of rules of thumb when it comes to power level.
1.) Each power level roughly translates to 20 points.
2.) The PL of a given unit roughly reflects the cost of that unit if it had all of the most expensive wargear available for that unit size.
So with that in mind, the not terribly precise method of reverse engineering a unit's cost would be:
1. Figure out what combination of weapons would be most expensive in terms of points.
2. Round the total points cost of those weapons up to the closest multiple of 20. (So a total cost of 50 points would get rounded up to 60).
3. Divide that number by 20. This is how much of the unit's PL is presumably reflected by its most expensive weapon options.
4. Subtract that PL from the unit's total PL.
5. Multiple the difference by 20.
6. The product is theoretically roughly the points cost of the unit without its weapon options.
Again, this is not precise, and you might run into some weirdness if the vehicle has multiple unique pieces of wargear that have a cost of 0. Three different big guns might be close enough in value to warrant being the same PL on an open play vehicle, for instance, but they might have significantly different levels of efficiency that would normally call for a difference in points value.
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