There has been a loty of good information been provided by some of the earlier posters. As someone who has built a number of small boats and helped build a number of small boats, I must say that there are two types of people who successfully build their own boats. The first group are people who enjoy building boats as much as, or more than they enjoy sailing. They are self-starters with lots of spare time and don't mind devoting, sometimes for years of their life, nearly every weekend and evening to the hard work of building a boat from scratch. For them building their own boat is its own reward.
The second group has very unique and specific goals for their boat, are very experienced sailors with strong ideas and could not afford to have a boat custom built for them. Only you know if you fall in the first group but it sounds like you clearly do not fall in the second group
Other than those two groups, and I personally think that there is no good reason to build your own boat. The market is full of boats of nearly all descriptions that will be far less expensive to buy and customize, than to build from scratch. This is especially the case if you place any value on your time, or if you consider then small resale value that used custom boats have in the marketplace relative to equal quality production boats of the same age, let alone older.
Building a boat, even with a well thought out kit, requires a thousand little decisions that ultimately make the difference between a boat easier to sail and maintain versus a boat that is a nightmare to sail and own. I have been aboard and helped rebuild/repair, and sort out home-builts in both caegories. The difference is often a builder with decades of experience in sailing, boat maintenance boat building. If that's not you I suggest that building a boat as complex as this one might be a poor idea.
As a sometimes yacht designer, I can only strongly recommend that you chose the best possible design that you can find. The cost of the design is cheap (often only a few percent) compared to the cost of the finshed boat. A good design will produce a more enjoyable boat to own and a boat that will be easier to resell should you outgrow it.
The design in question, while pretty to look at, is a very mediocre design. This is not especially an ideal design for a first boat, and compared to other choses out there is perhaps halfway decent for a slightly updated 1960's era design, but we have learned a lot about seakeeping, motion comfort, ease of handling, and performance since then. The GlenL in question is a material intensive design and so will require more labor and money to build than a more up to date design.
I think you would be way ahead of the game with a design like Dudley Dix's Didi 26
Didi 26 radius chine plywood boat plans ,which at least is an up to date enough design that you might have half a chance of reselling the boat later on at a decent price and also a boat that should be quicker and easier for a first time boat builder to construct.
Whatever you chose to do I wish you good luck, suggest that you should feel free to come back and kick around ideas as you think this through, and hope that you will let us know what you end up doing.
Respectfully,
Jeff
thank you!!
I have a trimaran, which is obviously the superior design, having best characteristics of a monohull and a catamaran and the same number of hulls as both added together. 
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