Speaking as a happily married wife and the Mame fan of our family, I feel I have a unique perpective on your dilemma. This is probably a great betrayal to wives everywhere, but I must tell you that the classic wives' closet trick works very well in this hobby.
If you're not familiar with it, it works like this. We wives, when making a large purchase, will stick half of it in the back of the closet, so that our husbands never have to lay eyes on the entire purchase at one time. Then, we slowwwwly assimilate our purchases into the household, one piece at a time. This way, there is never one concentrated pile of expenditures, staring at you both accusingly. No good will come of that pile - it almost always makes the "How much did THAT cost?" question unavoidable.
Keep the wood, computer and electronics all stashed in separate, unrelated piles. Don't break out the buttons and wiring until they are needed. Your wife, being the intelligent woman that she is, may possibly recognize this as the classic closet trick, but she certainly won't want to call you out on it. After all, fall shoe clearance sales are right around the corner.
