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So I am in the process of putting together a megabattle in my local are which will not only include 40k, but AI and BFG. I want to be able to transport troops to the battlefield but I am at a loss as to a conversion factor when it comes to troop transports from AI to 40K.

In the original AI book the Tau Manta (my bane) can carry XX troops. Now, granted the Manta point cost is 4.8 points per troop where all the rest are 4.5 or 4, so I think it may be priced correct for AI, but I think it may unbalance the game of 40k.

My thoughts of conversion from AI to 40K:
1.) Each transport point in AI is equal to 1 squad of 40k infantry
=> The issue with this one will be that the Tau can transport XX units into battle where as the Space Marines, IG, etc can only move XX models, unbalancing the force.
2.) Each transport point in AI is equal to 10 points of 40k models (this will allow for vehicles)
=> Again, this may unbalance the Tau, as I am not 100% sure of the point cost of Tau troops and vehicles (don't have my codex with me)
3.) Each transport point in AI is worth a race-specific amount of models or points
=> I think this may be seen as unfair by the players who may be using them.
4.) Each transport point in AI is worth a ship-specific amount of models or points (designate the Manta as being able to only carry 1 vehicle or XX number of models/points)
=> Again, i think this may be seen as unfair by the players who may be using them. Penalizing them for their race being able to bring a load of troops.

Thoughts? Has anyone done something similar?

I guess my solution would be keeping the "modes of play" separated somewhat.

Meaning, that each side has X amount of points for BFG, AI and 40K, and has to field at least XX amount of troop transit ability. This could be a way of fleshing out the campaign.

Example: 40K mission, Extraction.
Your force has been outmaneuvred by the enemy, and you need to extract them from a hot zone. Target for defender: Hold on to a mission objective (airstrip or something) for x amount of turns.

This would then open up for a AI fight, where you need to bring a set amount of troop carriers in and out within a limited number of turns. And of course your enemy wants to destroy your transports.

Just some thoughts, hope it helps