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I believe a ruin has to be permitted by both players to allow walkers and MCs to even enter them.

FMC can fly to the top levels of buildings. MCs aren't technically allowed to assault the mid-levels of a ruin and however the brb says that all types of Jump Units are able to. There is also the problem of fitting them in the level. I believe there is a rule that doesn't allow you to place your model if it doesn't fit. But as a jump MC can I assault if I can fit?

So is there any condition can a FMC assault a ruin? Or is the ruin totally anti-FMC like bikes? I have considered flying the FMC to an open ledge or balcony first, then go into gliding mode/jump mc and assaulting that level the same turn. Granted, this train of thought severely limits what kind of ruins I can assault and relies on the opponent's poor unit placement. I'm not arguing for Wraithknights, Dreadknights or Riptides, but the much smaller Daemon Princes.

What is the general consensus for this ?

There is nothing stopping Walkers and MCs from entering ruins, they just can't go above the ground floor.

As you surmised, though, FMCs can go on upper levels so long as they physically fit.

I assume by your use of the word 'enter' you are meaning onto the upper part of the ruins and not the base of them. There is nothing preventing these units from entering the base of the ruin, it is just area terrain after all, but such a limitation for the upper parts of the ruins do exist. Page 98, for those who want to review them for themselves.

It is very interesting that it states 'all types of Jump and Jet-Pack units.'

Normally any model that has the Jump/Jet-Pack unit type is bound by the rules of both it's original unit type and any that affect Jump and Jet-Pack. If a rule stated it affected Monstrous Creatures, then it would also affect Jump and Jet-Pack Monstrous Creatures. In this case though, the rule does state all types, and this is the very same rule setting the limitation what unit types can go into ruins. It would be an easy argument to state that it gives permission for jump/Jet-pack monstrous Creatures to enter the upper floors of a ruin. Of course, that is assuming it will fit in the position you are trying to place it as that is one of the limitations mentioned in that very same paragraph.

One thing I do want to point out though -
You are required to change the flight mode before you move. You won't be able to fly over the ruin and then, in the middle of that move, suddenly change the mode to gliding. This would put a slight kink in your plan, as you might have to wait for the next turn to change modes and assault. Alternatively you could still choose to move 12 inches if you are close enough to simply jump onto the floor you intend to assault, or you could decide to use the jump pack to reroll your assault charge and hope to make the distance that way.

Jinx: That's what i intend to do, fly close as possible, then change mode to gliding the following the turn and assault as a Jump MC not a flier. As long as I can fit. =X