Below is an example of how you could stitch (I don't want to call it "Frankenstein") a startup pitch deck together using the slides that are available in the template store. It is tricky to design a generic startup up, the upfront bit of these decks is highly specific to the company and the marketing it is operating in. Towards the back, things get more generic (team, financials, pipeline, roadmap, etc.).
I will give this template a bit more thought, and I will also turn my attention to other standard presentations such as quarterly results presentations, kick off documents, Board meetings, etc.
The deck above can be pieced together from individual slides in the template store, or downloaded in one go here (4:3 PowerPoint only for the bundle). Have a close look before you do to make sure this is the flow that fits your company. Subscribers can download at no extra cost and experiment freely.