@@DoomStarRequiem both mechs are at lvl 1 and considered 2 high for a total height of 3. They should have a clear LOS to each other and can fire as normal. If the intervening hill was lvl 3 or higher then they would not have LOS. If the catapult had an ally with clear LOS to the locust then you could spot with it which applies a mix of modifiers from both mechs.

Battlemech manual, it will take a good number of games before you'll want to add other unit types. It's just written better.

A critical hit to an ammo slot will always cause an ammo explosion. It can be mitigated by CASE and CASE2, or by dumping your ammo. Some weapons like gauss rifles have inert ammo but explosive weapons instead.

No, a hex is 30 meters wide. Plenty of room to shoot past other mechs.

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Dont know which book you're looking at but mine says kicks are 1 damage for every 5 tons and punches are 1 damage for every 10 tons.

Correct I made a mistake and used 10mp for the commandos 9 running mp. Ignoring the last turn the example is otherwise correct.

take a look at battletech alpha strike. it simplifies the game a ton for faster play and all the rules you need for your units are little cards that come with all of the force packs currently available. turns all that work needed just to do damage into "I need to get a 6 to hit, rolled an 8, so I do 4 damage". nice and easy. no worrying about ammo, all of your weapons, or hexes, or all the different parts of your mech, and the only table is the critical hit table. it still has a good amount of depth to it, but not so much that it's super daunting to learn. rules are free online too.

LRMs are marked with a size ex: LRM15 that determines the number of missiles it fires. The hit roll is if it hits at all. The cluster roll determines how many missiles hit out of the bunch. Those get divided into separate location rolls for each bundle of 5.