Meaty,
You may consider the cost of such a conversion. With the Saiga 12 running much more expensive than the other Saigas, adding the cost of such a custom conversion would put it in the realm of other semi-auto shotguns. You could find something like a Winchester Super X3 for around the cost of what I figure a one-off conversion like that would run, if not less. A purpose-built hunting or clays shotgun is going to perform much better for those purposes.
Plus, you're taking away the essence of what the Saiga 12 is - a very reliable, mag fed 12 Gauge AK-47. I can't imagine there would be much market for that.
You may consider the cost of such a conversion. With the Saiga 12 running much more expensive than the other Saigas, adding the cost of such a custom conversion would put it in the realm of other semi-auto shotguns. You could find something like a Winchester Super X3 for around the cost of what I figure a one-off conversion like that would run, if not less. A purpose-built hunting or clays shotgun is going to perform much better for those purposes.
Plus, you're taking away the essence of what the Saiga 12 is - a very reliable, mag fed 12 Gauge AK-47. I can't imagine there would be much market for that.