The blueprints for these 3 wonders can be attained through finishing the 3 variations of the Crete "Horde Mode", Cretins on the Coast! You will need to do each wave setting at least once for this as the 10, 20 and 30 wave settings each have one of the Wonders as a reward. ie. Completing Cretins on the Coast! with 10 waves will allow you to choose the Temple of Minos as your reward. Be sure you select each blueprint as your quest reward the first time around, especially if you don't plan on repeating that wave size.
In my experience, the first map, Sea of Crete, is the easiest to get each of them on as there is only one pathway to your Wonder and it starts off with a few towers along it. Load it up with more towers, stack infantry and archers on it (I never used cavalry) and make sure you max out your population with about 1/3 villagers doing work and the rest military standing guard. I'd start off with 1 barracks and 1 archery range and move to 2 of each around wave 15/16 and 3 of each around 24~. The biggest issues are the siege weapons, primarily the catapult (and also Ballistas, when they appear), they pop up in the 10th wave and become really common after around wave 15 (hence the 2nd barracks/archery range). A bit of practice and focus will net you the three schematics easily... then you just have to go back in and farm for the materials.