I myself am near finished designing a cupholder that fits into one of the storage cubbies below the radio. I designed one for the ashtray, but the problem with any ashtray design is that is interferes when shifting. My design eliminates that problem and should be more sturdy. My final iteration (hopefully) is on my 3d printer right now. If anyone is interested shoot me a message!
Also, if you can installed a double-din radio like myself, the one I have designed will work perfect in the remaining cubby above the relocated A/C controls. My design also still leaves the cubby usable as it's structure is hollow!