the Julianos looks good but sticks up a bit more than the original, I have not installed one or seen the instructions. If they want the upper trim to be pop riveted to the roof, I would not do that!
If you decide to go more original save the original upper trim if possible because the reproduction trim is very hard to bend to get the correct corners. The biggest problem is getting this upper trim bent. Some that have done it suggest using a wood "shoe" as a pattern and bend the trim into the shoe.
I have not heard of a removable soft top, but it could be done, if your looking for a moon or sun roof why not.
Mac's offers the soft top parts as well as LeBaron Bonney