With Builders Hut at 25 you can get your Flak and Ice Turret to 41.
To get Flak and Turret to 34 you need Storage at level 40. - You need to be level 118
To get Flak and Turret to 36 you need Storage at level 44. - You need to be level 130
To get Flak and Turret to 38 you need Storage at level 48. - You need to be level 142
To get Flak and Turret to 40 you need Storage at level 51. - You need to be level 151
So you’re good and don’t need to stress about getting sapphire eggs just yet.
What you should do right now as you’re level 114. Use @mechengg Fortification planner and see what upgrades you need to do to hit 118 (focus on Storm>Blue mage>Red mage on Kill island)
After that upgrade storage to 40 so you can level your flak and turret to level 35.
Next step go into planner and see what upgrades you need to do to hit level 130. (At this point you will probably have to get your Storm, Mages on kill island to level 34.
You will need to upgrade your Storage to 42 to bring your Storm and Mages to 35. When all the towers on kill island are 35 and you are level 130 then repeat the steps above - Upgrade storage to 44 and do the same thing with Flak and Turret. If you’re not 130 at that point that’s when you need to level 1 of your backup towers just until you hit 130. Then keep doing as stated above.
Hope this makes sense.