I have run the DLE35 rear exhaust on both pipe and canister. Its positives are very very easy starting engine; it's a rear exhaust so it fits easily in a pattern plane; good idle. Negatives: it turns smaller props (eg. 19x10 XOAR laminated). The reed cage needed some work on my engine to get it working properly.
You should definitely run a Hyde style soft mount. Thenose ring will require a clearance notch to fit around the Hall sensor. It's not a problem; I've been doing exactly that for 5 years.
If you have not purchased the 35RA yet, consider the OS GT33. It is a more powerful engine turning larger props on pipe. Plus you can use APC props which are much better than the wood available today. Look at my sticky on the top of the Patern Forum page for details.
Good luck any way you choose