I thought this would be of interest and pertinent to the discussion.

Very much so.

You can see that the bomb bay was originally intended for just four 250lb. bombs. They were able to accommodate 4 x 500 lb. bombs by cropping the vanes. But look at the Small Bomb Containers. Only two of the smallest variety can be fitted. Not much use when you’re trying to burn Berlin to the ground.

That the 4000 lb. Blast Bomb could be accommodated by bulging the bomb bay was useful, but it seems the limiting factor wasn’t weight but dimensions.

I was under the impression that because a 4000lb ‘cookie’ could be carried a mosquito was capable of carrying four 1000lb bombs but this would seem not to be the case.

As you say the greatest proportion of damage to German cities was done by fire rather than by explosives; they were burn-down not blown-up. It was also important as part of the plan that the bombloads arrived in the shortest possible time so that the thousands of 4lb incendiary bombs taking advantage of the roof, door and window damage caused by the 4000lb blast-bombs would saturate fire service (and homeowner) prevention efforts. I doubt very much that the 4lb bombs would land anywhere near where the 4000lb bomb did?

So the similar sort of damage could have been done and even with a loss rate the same as heavy bombers 5 aircrew could have been saved?

I think that is unlikely given the information above about the small number of incendiaries the mosquito could carry.