Getting started with Pier and Seaside apps

I am just getting started with Magritte and/or Pier. The goal is to edit some fairly lengthy form-like objects: people, property, and transactions involving those things. not knowing much this feels very Pier-like, with each of these created in a form-based editor and links among them. On the transaction side there is a need to send subsets of these things off to other sites and systems, and then create new related things from the results, e.g. "proposals" and so on. So as I understand the tools, Magritte would be good to describe these things and Seaside would be good for the transactional user interfaces. Just HTTP and HTTPS would be used on the back end of the transactions. How well would Pier fit in here? i.e. creating the objects in Pier and then having some Seaside and other code refer to those objects, formatting them for HTTP methods. On the back end of the transactions I'd want to parse the incoming information and create Pier objects from those. Reasonable? Easy? Any suggesttions? Thanks, Patrick