Your intention is to mix steel lugs with Titanium tubing? Lugged/bonded titanium frames have been done, but they are kinda one of a kind, and probably quite expensive. However I think pressed steel lugs do not provide sufficient area for an epoxy bond. Moreover, Ti is not as strong as steel, and thus in order to save any weight the tubes need to be larger, and thus would not fit in the lugs. And using the crown with Ti is probably impossible...