Can anyone who is familiar with this boat or has one please advise me on how the inflatable keel was originally attached to the floor of the boat? Was it glued in, attached via velcro or simply kept in place by the air floor above?
It is going to depend on how old it is.
The Zodiac inspired ones are designed so that the floor rest over the keel and they are connect by a single HP airline
Looks like this keel may have replaced the original at some point and was attached with heavy velcro instead of glue. I put in some new velcro and it works just fine. I purchased a 5hp Nissan two-stroke motor for this boat and on plane it will travel at just under 30km/h GPS speed.
Was thinking same, PO did so. Just center keel air valve in middle of wooden bow floor hole and inflate to min 3.0 PSI along tubes for a nice water ride.