Is it OK to request a lump sum payment as I know my H now has liquid assets from the sale of the house?
Most definitely. A bird in the hand is better than a bird in the bush. Do not be timid, polite, overly fair, accommodating, etc.
He is the type likely to quit his job to avoid making support payments- and sit home living off those assets until they dwindle-and he has a six figure capital gain, right now.
It's possible his lawyer will insist upon payments over time. So ask that the funds for those payments be held in
escrow until paid out. You don't want to get a court order and then have to keep going back to court over and over to seek eventual compliance. That's expensive. He would rather pay his lawyer than pay you.
Selling the house after filing for divorce is likely a huge No No. Will he face consequences? Possibly not. It may be as your lawyer says, it's
leverage that you can use in negotiations and court if need be. Frankly, you don't care, as long as you get your legal portion of the marital assets.
Yes, you do tell YOUR lawyer all about him. Your lawyer needs to know who/what he's dealing with. With others, though, be more cautious about what you say. For a short marriage without children, most of the officials and agencies won't care about the details unless there was substantive abuse.