Unless building a proven kit, you should consider the microphone, measurement software and at least DATS as a requirement. Even still... I wouldn't want to proceed without, as there are just too many variables. Even in the drivers themselves.
No real need to have flat-packs of wood or MDF shipped to you if you have the access to a wood shop/tools to fabricate your own cabinets.
Towards this last part, Active Speakers will still require measurements to tune the active XO correctly. I don't see this as a shortcut, I'm afraid. I have yet to build an active XO but am considering it for a future project. Of course, I already have two different measuring systems and can utilize at least one of them for most practical purposes (programming MiniDSP).
Though I fully encourage learning more about speaker design and embarking on such an undertaking... I can't help but think you will be spending a lot more to get started on a DIY project based on what you've described.
That said, doesn't Peerless manufacture in India? They do have some respectable drivers. It may be possible to find a design that can be built using locally sourced product... but will likely take a good deal of research.
You could throw caution to the wind and not do any measurements... but then you'll never know how the project turned out.
