gt6+ to choose

well i just recently settled into designating my spitfire as a runner and will be putting my 'restoration' efforts into a gt6 sitting in my dad's garage. the problem is that garage is 700 miles away and....i just happened to find another one here in montana(it actually found me as the sellers business card ended up on my spit's windshield) so here is a question. what's harder/more expensive to replace, sills or floor pans? i'm good at welding but thick tube metal structure stuff, haven't done thin sheet metal but will be practicing soon. as much as i would like both gt6s i have little room for the one that i have currently. so... any ideas are welcome. thanks.