You are limiting your speed potential by building a belly tank lakester for turbine, it was mentioned earlier, you need to pay attention to that. It takes a lot more HP to run an open wheel vehicle.
What kind of HP are you planning...
Streamliners get 5 miles, lakesters have to qualify to get more than 3.
Your tire strategy will not work as also mentioned earlier, rethink it.
Before you build, come to the salt to see how others build. You probably won't see a lot of turbine cars, but powerplant is a choice, car types and how people package will be what you need to look at.
Good luck with your project, we look forward to more info 
I'm with stainless here. Building a liner over a lakester gives you way more options and way better control over your aero package. Unless there is some other reason you are going after the lakester class...perhaps an open record in omega there?
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