Two things I forgot to ask :
(a)for the vegetable garden, I understand that when planting from seeds, fine spray is better than dripper (will make dripper hose removable) - what components would you suggest for this purpose ?

(b)On the diagram you see "grass" - this is only a narrow path
until the grill area - can some small area micro sprinklers be used ?

vj,

In my humble opinion, your description is too complex and I would need to know the pressure and flow of your water source, take soil tests of your growing areas and do a profession take-off at the site to give you any meaningful help. You are asking for a professional quality opinion which would take extensive effort and calculations, so I suggest you hire a local landscape/irrigation professional to visit the site and he/she can do the appropriate tests of the water source and soil that would best suit your needs, budget and make your request a success. They would also guarantee their work. JMHO and GL Aloha

lehua,
Unfortunately the money situation is such that I'm stuck doing this on my own.

What difference would the pressure and flow of water have on grouping plants ? I'm no irrigation specialist but my logic tells me that once you have grouped your plants and/or established a drip scenario which
could cover certain plants, then you need to know whether the water supply will allow it without breakdown into more zones - or have I missed something obvious ;) ?

What I'm after is just a comment on whether my grouping of plants (which by default I made into separate zones) could
be reduced i.e. are plants from one or more of those zones compatible in their water cycles to be joined into a bigger group / zone if the water supply allows it ?

I had a few postings in this forum before about my concern about which plants could be grouped but the answers implied that you could water anything if the supply was there.

As far as I understand fruit trees, citrus trees like deep watering - eg once a week. Vegetables every day or once every two days and so on. Which plants would you definitely put on a separate zone just because their watering needs
are not compatible with others (forgetting about water supply for a start) ?

vj,

You may find more horticultural practices water demands in the specific forums for the plants you have. Once you have that information, this forum can help with setting up your controller or how many zones needed to accomplish that. Yes for planning purposes you need water pressure, water flow rate and soil type to do a design or verify a design but trial and error can work as well as long as your system has capacity and flexibility since the demand of plants change with their life cycle. In summary, I think your are asking for more than this forum can recommend. You need to ask other forums for info and then this forum can make recommend. You need to do most of the research. If others have a different opinion or more information please join in. JMHO Aloha