Ferro Laminar armor never becomes commonly available. ICE and Fusion always commonly available . Fuel Cell engines for combat vehicle uncommonly available until 3071then common , XL fusion Available 3041 , Light Fusion 3065 commonly available . Laser Reflective gets made by everyone at some point.
I chose 18 and 16 points of standard armor against a lucky Gauss Rifle hit during the hopefully short window of deploying battle armor or infantry . Theoretically my choice is advanced and possible in all ERAs and common Tournement Legal 3071+ . An FL armored Omni VTOL might be Experimental 3075 ? Advanced in later years and I do not think it becomes tournement legal tech even in the 3145 Dark Age.
The Clans have very few stock mechs with FL armor and would not like to sacrifice any to vehicle construction if you could help it . Inner sphere units that Maintain a Solaris VII stable could perhaps keep running a lance of light vehicles with experimental tech easy enough but FL armor would be a loss leader where vehicle stealth armor would just get hit less makes the most sense .
I think the Warrior S9 ? From the prototype book is a cool VTOL that the WoB made very few of. It can shoot at medium range its entire payload with near impunity . Clans do Batchal to limit reasouce losses . Mercenaries are running a business , house units want cheap replacable attrition vehicles your ideas are too expensive for general use.
VTOL s are fragile . A VTOL on a battlefield with FL armor becomes a relevant valuable target because salvaging left over armor from a downed VTOL is just about the only way to get any of it at all for most opponants. Even if it is in infantry carry mode it drops off its troops and the enemy normally concentrate its fire on units that are shooting back but given an aft aspect parting shot to hopefully get a massive motor critical so normally unattainable armor salvage on the battlefield.
Combat Vehicles lose only about 20-25% of their armor before they become immoblie from motor criticals. Mechs frequently require 75 % or more before they are taken out of action . By all means field expensive experimental FL armor units .
That's a lot of time spent on Ferro-Lamellor armor for what was overall just a single sentence.
Your theoretical VTOL does. My Karnov-Lite that I described earlier also fits the bill for any era that has omni-tech, but it does so more cheaply than the 30-ton fuel cell "Super-Karnov", while being convertible to other roles. It also can survive a lucky gauss shot to the front and sides, though it needs a critical hit role for the sides.
As a fact check: The Clans
do have a ferro-lamellor combat vehicle production models, all of which are easily just as if not much more expensive than a F-L omni-VTOL could ever be, and with less utility to boot. The Aithon Assault Transport costs around 21 million C-Bills by itself, the Gurzil Support Tank costs around 15 million C-Bills, and the Chalchiutotolin Support Tank (XL) costs around 5 million C-Bills. Most 30-ton VTOL variants never come close to breaking 5 million C-Bills even with the help of XLs, advanced armors, and the omni cost multiplier. So no, the Clans don't mind ferro-lamellor being diverted to vehicle projects, even when they're rather pointless.
I mentioned FL armor because it alleviates VTOL vulnerability issues
a lot. Well-built FL VTOLs can go into much hotter than normal warzones while maintaining good survivability and can easily tango with other light vehicles and also light 'Mechs, and packs of them are very threatening to the heaviest 'Mechs. But you don't necessarily
need FL armor to make a good Omni-VTOL. The "Karnov-Lite" build I mentioned earlier is decent enough, certainly fast enough to get the job done and it has enough space to put on some decent, usually lighter and energy-based solutions for fire support