Sewage Ejector Pump Lid needed

Hello,

I have a sewage ejector pump in my basement. The pit is 24"across when measured with the lid off, and the lid is 26". Based on measuring with a stick from the top of the open tank, it is about 33" deep. I would like to change the lid to a steel lid, but I can't find the manufacturer of the pit/basin. I've included a picture.

Other questions include:

1. I know there are check valves that don't slam. How reliable are they?
2. Should/can I attach the waste pipe to a concrete wall via braces to avoid vibration?
3. The pump is approx 9 years old. I am doing renovations in the basement and adding several fixtures - should I replace the pump if it is not malfunctioning? (I don't want a flood ever....)
4. In the basement I will have 2 bathrooms (2 lav sinks, 2 toilets, and a shower), a kitchen with dishwasher and sink, a laundry room with washer and steam dryer, and heat pump condensate. What size pump do I need?
5. Can I vent a toilet and sink to the same vent that serves the ejector?

Thanks for any info!

Why do you want a steel lid?

I wouldn't replace the pump unless necessary, but that depends on the model and age of it as well... I would however install an audible level alarm regardless.

I don't know that they're universal, but the one I have sure looks a lot like others I've seen.

I've never seen a steel lid, but you could have a shop make you one up that will fit OVER the existing one?

That's an idea. The work I'm doing is by permit though.... i wonder whether putting a lid over another lid would pass?

What about the size of the pump? Is there any way to tell size without pulling the pump out? What's the appropriate size for the number of fixtures I'll have?