I spent whole day thinking about this challenge and yes.. I have to try it.. now there is a lot of thinking about the strategy..
First - anyone plan to use omniplant in science facility garden? after catching one dead fish one can multiply it there as much as needed. And if first generation or a spouse catch it before maxing fishing there is a free and easy supermax skill for future generations. Once it happened that I catch all dead fish from grave yard and they didn't spawn again.. not shore if this was fixed later but wouldnt risk it when there is easy and less time consuming way - feed the omniplant.
Gardening - If anyone knows if only harvesting increase gardening skill? Ill check it myself, but even if it does, it would be enough to get lvl 7 gardening to plant special seeds, and let the spouse harvest and weed plants avoiding watering with sprinkles. It should be enough to keep them away from reaching lvl 10 and leaving it free for future generation.
Supermaxing martial arts wouldn't max athletic - at least for sims without athletic trait. Again, free and easy supermax skill:)
About nectar making.. does the same sim have to plant, tend and harvest 400 grapes from homegarden to get that skill challenge or?
About those photographs of sims which are labeled as something else as "nice garden" or something, I didn't find the final explanation of it, I understood about no expensive targets as dragon cave etc but its ok to have a running sim or apple tree?
And collectibles are not forbidden but only not counted in museum value?
And last one, how often do immortal sim eats ambrosia? For every meal, once per day or once per week?
Uhh many questions came up hehehe and I haven't even started