No idea how much guilder/GBP exchange rate was in early 90s, but virtually the Phoenix would be 5000 GBP according to XE converter. You could buy a small car for the same money.
The Fisher Alembic was going to cost $6000.00 in 1992, but the company changed hands and only 7 were built before the project was abandoned by the new owners. The Lawwill rear suspension was used and the frame mold was built by Toray in Japan at a cost of $80,000.00 I owned and restored one of these bikes-here it is.