Mine won't be a tube but as soon as I get my CNC machine I'll be making something with the DNA board that is a little closer to the tube form factor. No screen though. Screens aren't that usefull imo. If you have a live variable setting (i.e. you can change it and immediately take a hit to check it) it's faster to just put your juice on and dial it in for your different flavors. the screen is just another 'thing' that isn't really needed. With VW you don't need to know your resistance.
I've got 2 provaris and I never look at the screen except when I'm changing voltage. I use the same brand/resistance carto and for my personal tastes the .2ohm variances I get on the cartos isn't a big enough deal to adjust the voltage so I basically never use my screen at all. I know how long my battery lasts in general and I just change it out every morning before work.
When I first started vaping I was REALLY into all the little doodads and accessories for vaping. I had a bunch of egos and other little thingies, now I just want to vape. I buy pretty things now like fancy tanks and drip tips. I want the vaporizer itself to be simple and variable. The one I'm going to be making will be sort of a tube/box hybrid (it wont be a box but it wont be a tube, more of an ergonomic shape) I'll put a dial on it, a hand machined 510 connector for durability, and a mini USB port to charge it. The battery will be accessible but you won't want to take it apart to access it, it'll be better to just charge it. I'm also making a battery pack like those cell phone battery booster boxes that I can carry when I know it's gonna be a particularly long day and I'm going to exceed my single charge time on the mod itself (overnight fishing trip or a long party night).