This is a tricky one, as it depends on a whole heap of factors: firstly, we start from the premise that we want to open up access to as many people as possible including bikes and those using mobility equipment. This means that we need to find level routes with very gentle gradients...not particularly easy in West Somerset, but they are there!
Secondly, it requires the availability of land. Routes that might be suitable in terms of gradient, might not be suitable if they run through the middle of someone's farm yard, or result in unacceptable ecological damage by cutting down important hedgerows. It is down to the private land owner whether they are agreeable to working with the Steam Coast Trail, they are totally within their rights to tell us to go away! Thankfully a number of them are very supportive of the project.
Thirdly, it comes down to money. It is surprising just how expensive building a multi-use path can be, and large grant funding pots are few and far between. Where the path goes will depend on how much money we can get to spend on the build. Clearly, the longer the off road path, the more expensive it will be. We have to strike a balance between what is a good route, and what is a fundable route.
That doesn't exactly answer the question of 'where'. We do have a good idea, but until the three elements above line up, it would be rash to jump the gun!