Learn Finnish: Myös nuori laulaja haluaa tulla ihailluksi. - The young singer also wants to be admired.

In Finnish, expressing that someone is the target of an action (a passive experience) is often done using the verb tulla (to become) rather than olla (to be). The construction tulla plus the passive past participle in the translative case (-ksi) describes the transition into that state, so it essentially translates to 'to become admired'.

How exactly is ihailluksi formed? Why does it have a double ll instead of lt like the basic passive participle ihailtu?

The base verb is ihailla (to admire), and its passive past participle is indeed ihailtu. However, when we add the translative ending -ksi, the syllable closes and triggers consonant gradation. The consonant cluster lt softens to ll, changing the stem to ihaillu-. Adding the ending gives us ihailluksi.

Could we place myös somewhere else in this sentence?

You can, but it changes the meaning slightly. The word myös modifies the word immediately following it. Here, myös nuori laulaja means 'the young singer also' (in addition to older singers, for example). If you wrote Nuori laulaja haluaa myös tulla ihailluksi, it would mean the singer wants to be admired in addition to wanting something else.

Since tulla ihailluksi carries a passive meaning, why is the subject nuori laulaja in the nominative case?