I had to put my Rx under the servo rails so I could move the tank in and out without a complete gut. It all depends on where you happened to mount the servo rails. Mine were fairly far back which helped; the tank can sit in there and then slide forward into the tank compartment.

I had mine at the field for check-out 2 weeks ago; Ran into some engine issues; Pulled the tank and re-did some tubing and just finished re-checking today at my house. Eninge seems to be reasonably tuned and runs good. Man the ST-90 sure pulls like heck; I can barely hold the plane back as I was checking the running at full tilt up.

Now just waiting on the weather; rain for next 5 days if you believe the forecast ;-(