The problem with touchscreen use in Reaper is that we still don't have full multi-touch support, so you can only control elements one at a time. I've definitely seen some themes with big elements designed for touch though.
Alternatively, you could use OSC and an ipad or similar to control Reaper remotely. Then you will have multi-touch if the device supports it and you can customize the interface with just the elements you want, sized the way you want.
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