Full size teak swim platform

[nipper]

I am going to add a teak swim platform across the entire stern of my 1991 V20 cuddy with I/O this fall or winter. I already have a small teak platform, but my kids (ages 7-14) keep complaining they like the full swim platform I have on my 1985 20' Formula a lot better. Any suggestions as to how high I should mount it? The transom does not have a lot of height to it. I might need to cut a portion of the platform out so there is clearance for the outdrive. I am guessing I would want the lower edge of the platform to sit about 6" above the waterline. Again, any assistance would be appreciated.