Headliner trim or not to trim?

[texjake]

I hope this is not a dumb question. I have been thinking of installing a headliner in my '68 truck. Mine did not originally come with a headliner & I have seen the other year model trucks that did come from the factory with one & they have the small clip holes in the cab roof to hold the trim in place. Can I install mine without the trim and will it still look ok? I know I can use the 3M spray adhesive to hold it up there forever - I hope. But I just want to make sure it will look alright without the trim because I really don't want to cut holes in my cab roof if I don't have to. And if anyone has any pics of their headliners without the trim please post them so I can get an idea of how it will look without the trim.