RE: Best way to convert my X to XL w/ mid tank
If you google fast lane machine, you should be able to find it. They don't sell direct from there website, but you can find others that do sell their products through google. I'm unable to post links from my phone browser, but like I stated, google fast lane machine savage chassis or flm savage chassis you should find what your looking for. Shop it around, the chassis will be about the same everywhere, but the servo plate and mounts will varie from store to store and FLM's website will give you a good baseline to go from on pricing.
I used the flm extended lcg chassis, flm servo plate, flm servo mounts, flm motor plate, Ofna 250cc fuel tank, and fuel tank mounts. The radio box I used was the hpi blitz radio box. PM and I can shoot you some pics of the set up.