Used Discovery D-3: Need Parts

[SoakEh?]

My sister-in-law gave us her used Discovery D-3 spa last year and, after replacing a badly cracked, leaking (freeze damaged?) jet manifold, we recently got it running. It works great now, but is missing the filter compartment cover and floating weir. I'm guessing that since Discovery has been defunct for a number of years, it's unlikely we're going to find the exact parts, so I'm hoping someone can give us some advice on what we might use as substitutes.

The opening where the floating weir goes between the tub and filter compartment is 13 1/2" wide. Our local spa outfit says they can't find a replacement weir that's narrow enough to fit the opening. Does anyone know of a source for such an item? Failing that, do you think it would be possible for us to get a wider generic weir and modify it to fit? Our local spa folks say the weir isn't all that essential, but it seems like it would help remove some of the floating crap that gets blown in when we're soaking during our current blustery spring weather.

For the filter compartment cover, I was thinking about getting a piece of that heavy plastic that's used for cutting boards and cutting it to fit. I figure that stuff might be strong enough that we could then use that spot as a a seat. Any other ideas out there?

Thanks,

John