requested:

implement in V4
be possible to create such application easily
basic description: set of forms -> according selection produce result page + select products on base of rules defined by Taxonomy portal

implementation proposal:

result:

short term implementation needed => implement in V4 directly => no general approach
long term implementation (Sitecore 8 + analytics required) => possible to implement widely (including possibility that other guides are done without development)

Site Architecture 4/2016