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So the wording on stone skeleton says to halve any wounds done to the stonehorn rounding up. Do you tally up all of the wounds and then round or do you halve them per attack?
So...
A) 10 models do 1 wound each causing a total of 10 wounds.
Or
B) 10 models do 1 wound each pooled into 10 wounds and then halved to 5 wounds total.

It's down to allocation. Until attacking unit has finished attacking, no wounds are actually inflicted on the Stonehorn itself - they add damage to a pool belonging to the Stonehorn Unit.
When they have finished, *that* is when you allocate damage from the pool to the Stonehorn as wounds as it's the only model in the 'unit', so you have the total wounds then.
So it's (b).

The rukes: "After all the attacks made by a unit have been carried out..."

Basically you only inflict the wounds once the attacking unit has carried all of its attacks. Then you halve them. If more than one unit is attacking the Stonehorn, then you halve them one total at the time until all units have attacked.