In the year 2000...
..don't you think you're entitled to have the wedding of your dreams? My husband and I paid for our wedding & reception, so I didn't give in on any "etiquette" issues. Although we did have a big wedding (300 guests), I also had a rather unconventional wedding party. My husband isn't quite the people magnet that I am,(and since I had my wedding planned from the age of 8!!!), we had an overflow of bridesmaids with not enough groomsmen. (8 bridesmaids -vs- 4 groomsmen). The etiquette police would have had me walk the "extra bridesmaids" out together - tell me what girl wants to be in a wedding and say, I was escorted by Tricia's cousin Angie!! I didn't think so either. So instead, I had two bridesmaids exit the church with one groomsmen. At the reception, I worked it out so that the married/engaged people danced with their significant other and the single wedding party danced together for the bridal party dance.
(We also went against convention with our first dance. Instead of a mushy love song, I chose a great oldies song called "Just One Look", to which we did a jazzy waltz around the floor!) The people at the Reception hall STILL compare every wedding party to ours (I know, because my sister works there now!) And I won't even get into the "Bride dancing on the table custom" in my family - needless to say, my wedding coordinator was VERY NERVOUS!!
So, don't worry about convention and custom. Remember that no matter what size the guest list, how long the train or the veil, YOU want to look back on this day and say, "I couldn't dream of a more perfect day!"