Those images in your post show doors made of multiple vertical planks. The planks can shift relative to each other, which is largely prevented by a diagonal compression brace.

Look at how a stick framed house is built. The plywood is typically all that is necessary to provide shear strength, as required by code. The plywood will not be the failure point of your door unless the wood becomes so compromised that it has no structural integrity. Keep it painted and you shouldn’t have anything to worry about.

Fastmail is another option that supports custom domains and wildcard addresses. It’s about $5 a month. Once you start utilizing your own domain, you can easily change email hosts if you don’t like one. The hardest part of this process is changing every service from your current Gmail or whatever address because you have to do it one at a time.

Fastmail will be your email host and you can send email using From addresses in your domain.

Just go to the box office when you get there and present an ID that matches the name the tickets were purchased under. Depending on the venue, they will either print your ticket or text you a link that opens a page in your browser that can be scanned.