The main point of taming, (I believe) is to be able to farm food and other resources a given creature can drop. Also... in order to stop stuff from burning down, you might need to build a shield you've unlocked few episodes ago. Not 100% sure, I didn't play in ages. xd
You can build a saddle to ride the Askvin. The shield generator protects your wood buildings/constructions from the raining fire (and also from ranged attacks).
Askvins best use is riding them, great for scouting, can run over lava, and they're faster than anything you might meet, so you can flee. Don't get off them until they're locked up though, cos the frekkin things will wander off with your saddle. You really need a shield generator for your base mate. It's a hoot watching you, cheers eh
Your new fortress base rather than build a door. Get some normal stone and raise the floor to close the door that you smashed down.. You will have to setup a portal system to get in and out your base but it will be impenetrable.
Kills, use iron for your supports! You can cover over it with stone for aesthetics! Iron is far better than stone, you've got the basics right, going into the ground with the verticals, but use iron, it's way stronger! You'll notice with the colours when you're laying the "roof"! 😁😁 Hopefully others will tell you the same thing?! 🤔😁 Keep doing the British thing, muddling on! 🤣🤣🤣lol
You could try laying the iron beams into the existing stone columns, which'll be a head scratcher, or remove those stone columns one at a time and replace them with iron?! 🙄 The second option might entail some choice words as roof segments start collapsing?! 🤔 Then again, the existing supports might inhibit the collapsing, so no choice words and you'll have a far more stable "roof" that you can build upon?! 😁😁